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

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

Panko 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: I61488fc092ac11eb9f606d54c8e1a6e57851c4a0

.zuul.yaml

@@ -1,7 +1,6 @@
 - project:
     templates:
-      - openstack-python-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:

doc/requirements.txt

@@ -1,7 +1,6 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-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,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0
 sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0

releasenotes/notes/drop-py-2-7-21cdb68d76ab2f6b.yaml

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

requirements.txt

@@ -29,6 +29,5 @@ alembic>=0.7.6,!=0.8.1,!=0.9.0
 # NOTE(jd) We do not import it directly, but WSME datetime string parsing
 # behaviour changes when this library is installed
 python-dateutil>=2.4.2 # BSD
-happybase!=0.7,!=1.0.0;python_version=='2.7'  # MIT
 pymongo!=3.1  # Apache-2.0
 elasticsearch<3.0.0  # Apache-2.0

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

test-requirements.txt

@@ -5,7 +5,6 @@
 coverage>=3.6 # Apache-2.0
 elasticsearch>=1.3.0 # Apache-2.0
 fixtures<2.0,>=1.3.1 # Apache-2.0/BSD
-happybase!=0.7,>=0.5,<1.0.0;python_version=='2.7' # MIT
 mock>=1.2 # BSD
 PyMySQL>=0.6.2 # MIT License
 # Docs Requirements

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
 skipsdist = True
-envlist = py{37,27}{,-mongodb,-mysql,-postgresql,-elasticsearch},pep8
+envlist = py{37}{,-mongodb,-mysql,-postgresql,-elasticsearch},pep8
 
 [testenv]
+basepython = python3
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt} {opts} {packages}
@@ -22,7 +23,6 @@ commands =
    bash run-tests.sh {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source panko --parallel-mode
@@ -34,32 +34,26 @@ commands =
     coverage report
 
 [testenv:pep8]
-basepython = python3
 deps = hacking<0.13,>=0.12.0
        doc8
 commands = flake8
            doc8 {posargs}
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:genconfig]
-basepython = python3
 commands = oslo-config-generator --config-file=etc/panko/panko-config-generator.conf
 
 [testenv:genpolicy]
-basepython = python3
 commands = oslopolicy-sample-generator --config-file=etc/panko/panko-policy-generator.conf
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = python setup.py build_sphinx
 setenv = PYTHONHASHSEED=0
 
 [testenv:pdf-docs]
-basepython = python3
 deps = {[testenv:docs]deps}
 whitelist_externals =
   rm
@@ -70,7 +64,6 @@ commands =
   make -C doc/build/pdf
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 setenv = PYTHONHASHSEED=0