[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

murano-agent is ready with python 3 and ok to drop the
python 2.7 support.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Depends-On: https://review.opendev.org/#/c/693631/
Change-Id: I343c7e7bde76f086e00756be63de48204dcdb0a9

.zuul.yaml

@@ -2,6 +2,5 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-ussuri-jobs
       - release-notes-jobs-python3

doc/requirements.txt

@@ -1,4 +1,3 @@
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0

lower-constraints.txt

@@ -19,7 +19,7 @@ fasteners==0.14.1
 fixtures==3.0.0
 flake8==2.5.5
 gitdb2==2.0.3
-GitPython==2.1.8
+GitPython==3.0.5
 greenlet==0.4.13
 hacking==0.12.0
 idna==2.6

releasenotes/notes/drop-py-2-7-33ea9091c6530815.yaml

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

requirements.txt

@@ -4,7 +4,7 @@
 pbr>=3.1.1 # Apache-2.0
 anyjson>=0.3.3 # BSD
 eventlet>=0.20.0,!=0.20.1,!=0.21.0 # MIT
-GitPython>=2.1.8 # BSD License (3 clause)
+GitPython>=3.0.5;python_version>='3.0'  # BSD License (3 clause)
 kombu>=4.1.0 # BSD
 oslo.config>=5.2.0 # Apache-2.0
 oslo.log>=3.37.0 # Apache-2.0

setup.cfg

@@ -15,8 +15,6 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
     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]
-envlist = py37,py27,pep8
+envlist = py37,pep8
 minversion = 2.0
 skipsdist = True
 
 [testenv]
+basepython = python3
 setenv = VIRTUAL_ENV={envdir}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 usedevelop = True
@@ -18,28 +19,23 @@ whitelist_externals = bash
                       find
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 {posargs}
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 commands = python setup.py test --coverage \
            --coverage-package-name=muranoagent --testr-args='{posargs}'
            coverage report --omit '*/tests/*'
 
 [testenv:debug]
-basepython = python3
 commands =
   find . -type f -name "*.pyc" -delete
   oslo_debug_helper -t muranoagent/tests {posargs}
 
 [testenv:docs]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -47,16 +43,13 @@ deps =
 commands = sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
 
 [testenv:pyflakes]
-basepython = python3
 deps = flake8
 commands = flake8
 
 [testenv:genconfig]
-basepython = python3
 commands = oslo-config-generator --config-file etc/oslo-config-generator/muranoagent.conf
 
 [testenv:releasenotes]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -69,7 +62,6 @@ show-source = true
 exclude=.git,.tox,dist,doc,*lib/python*,*egg
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt