Drop python2 tests

OpenStack is dropping the py2.7 support in ussuri cycle.
magnum is ready with python 3 and ok to drop the
python 2.7 support.

https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html#completion-criteria

Depends-On: https://review.opendev.org/693631

Change-Id: I2ce19b3f976619853117231ae0dae24ebe68601f
Signed-off-by: Diogo Guerra <diogo.filipe.tomas.guerra@cern.ch>

.zuul.yaml

@@ -62,44 +62,6 @@
       branch_override: default
       devstack_python3: 1
 
-- job:
-    name: magnum-functional-base-python2
-    parent: legacy-dsvm-base
-    timeout: 7800
-    pre-run: playbooks/pre/prepare-workspace.yaml
-    run: playbooks/magnum-functional-base.yaml
-    post-run: playbooks/post/upload-logs.yaml
-    required-projects:
-      - openstack/devstack-gate
-      - openstack/diskimage-builder
-      - openstack/ironic
-      - openstack/ironic-lib
-      - openstack/ironic-python-agent
-      - openstack/magnum
-      - openstack/magnum-tempest-plugin
-      - x/pyghmi
-      - openstack/python-ironicclient
-      - openstack/python-magnumclient
-      - openstack/virtualbmc
-    irrelevant-files:
-      - ^.*\.rst$
-      - ^api-ref/.*$
-      - ^doc/.*$
-      - ^specs/.*$
-      - ^install-guide/.*$
-      - ^releasenotes/.*$
-      - ^dockerfiles/.*$
-    vars:
-      ironic: 0
-      ceilometer: 0
-      swift: 0
-      horizon: 0
-      multinode: 0
-      neutron: 1
-      tempest: 0
-      branch_override: default
-      devstack_python3: 0
-
 - job:
     name: magnum-functional-multinode-base
     parent: legacy-dsvm-base-multinode
@@ -143,12 +105,6 @@
     vars:
       coe: api
 
-- job:
-    name: magnum-functional-api-python2
-    parent: magnum-functional-base-python2
-    vars:
-      coe: api
-
 - job:
     name: magnum-functional-coe
     parent: magnum-functional-base
@@ -368,15 +324,13 @@
     templates:
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-ussuri-jobs
       - check-requirements
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
         - magnum-functional-api
-        - magnum-functional-api-python2
         - openstack-tox-cover:
            voting: false
         - magnum-container-build
@@ -384,7 +338,6 @@
       queue: magnum
       jobs:
         - magnum-functional-api
-        - magnum-functional-api-python2
     experimental:
       jobs:
         - magnum-functional-dcos

doc/source/contributor/objects.rst

@@ -49,7 +49,7 @@ Object Change Example
 The following example shows the unit test workflow when changing an object
 (Cluster was updated to hold a new 'foo' field)::
 
-    tox -e py27 magnum.tests.unit.objects.test_objects
+    tox -e py37 magnum.tests.unit.objects.test_objects
 
 This results in a unit test failure with the following output:
 

doc/source/contributor/quickstart.rst

@@ -67,13 +67,13 @@ All unit tests should be run using tox. To run magnum's entire test suite::
 
 To run a specific test, use a positional argument for the unit tests::
 
-    # run a specific test for Python 2.7
-    tox -epy27 -- test_conductor
+    # run a specific test for Python 3.7
+    tox -epy37 -- test_conductor
 
 You may pass options to the test programs using positional arguments::
 
-    # run all the Python 2.7 unit tests (in parallel!)
-    tox -epy27 -- --parallel
+    # run all the Python 3.7 unit tests (in parallel!)
+    tox -epy37 -- --parallel
 
 To run only the pep8/flake8 syntax and style checks::
 

releasenotes/notes/drop-py27-support-7e2c4300341f9719.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release magnum support py2.7
+    is OpenStack Train. The minimum version of Python now supported by magnum
+    is Python 3.6.

setup.cfg

@@ -13,8 +13,6 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
-envlist = py27,py37,pep8
+envlist = py37,pep8
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command =
   pip install -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt} {opts} {packages}
@@ -24,11 +25,6 @@ commands =
   stestr run {posargs}
 
 [testenv:debug]
-basepython = python3
-commands = oslo_debug_helper -t magnum/tests/unit {posargs}
-
-[testenv:debug-py27]
-basepython = python2.7
 commands = oslo_debug_helper -t magnum/tests/unit {posargs}
 
 [testenv:functional-api]
@@ -109,7 +105,6 @@ commands =
   stestr run {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands =
   doc8 -e .rst specs/ doc/source/ contrib/ CONTRIBUTING.rst HACKING.rst README.rst
   bash tools/flake8wrap.sh {posargs}
@@ -123,30 +118,24 @@ commands =
       -print0 | xargs -0 bashate -v -iE006,E010,E042 -eE005"
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:bandit]
-basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -r magnum -x tests -n5 -ll
 
 [testenv:cover]
-basepython = python3
 commands = {toxinidir}/tools/cover.sh {posargs}
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:genconfig]
-basepython = python3
 commands =
     oslo-config-generator --config-file etc/magnum/magnum-config-generator.conf
 
 [testenv:genpolicy]
-basepython = python3
 commands =
     oslopolicy-sample-generator --config-file etc/magnum/magnum-policy-generator.conf
 
@@ -162,7 +151,6 @@ exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,tools,releasenotes
 local-check-factory = magnum.hacking.checks.factory
 
 [testenv:pip-check-reqs]
-basepython = python3
 # do not install test-requirements as that will pollute the virtualenv for
 # determining missing packages
 # this also means that pip_check_reqs must be installed separately, outside
@@ -172,25 +160,21 @@ deps = pip_check_reqs
 commands=pip-missing-reqs -d --ignore-file=magnum/tests/* magnum
 
 [testenv:releasenotes]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:install-guide]
-basepython = python3
 commands = sphinx-build -a -E -W -d install-guide/build/doctrees -b html install-guide/source install-guide/build/html
 
 [testenv:api-ref]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf api-ref/build
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt
@@ -199,7 +183,6 @@ deps =
 # This environment can be used to quickly validate that all needed system
 # packages required to successfully execute test targets are installed
 [testenv:bindep]
-basepython = python3
 # Do not install any requirements. We want this to be fast and work even if
 # system dependencies are missing, since it's used to tell you what system
 # dependencies are missing! This also means that bindep must be installed