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

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

storlets 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: I62239e865d2938f0fc7dc2755156206b29095524

.zuul.yaml

@@ -1,31 +1,18 @@
 - project:
     templates:
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - storlets-functional:
-            irrelevant-files:
-              - ^(api-ref|doc|releasenotes)/.*$
-              - ^(.gitreview|.mailmap|AUTHORS|CHANGELOG)$
         - storlets-functional-py3:
             irrelevant-files:
               - ^(api-ref|doc|releasenotes)/.*$
               - ^(.gitreview|.mailmap|AUTHORS|CHANGELOG)$
     gate:
       jobs:
-        - storlets-functional
         - storlets-functional-py3
 
-- job:
-    name: storlets-functional
-    pre-run: playbooks/storlets-functional/pre.yaml
-    run: playbooks/storlets-functional/run.yaml
-    post-run: playbooks/storlets-functional/post.yaml
-    timeout: 2400
-
 - job:
     name: storlets-functional-py3
     pre-run: playbooks/storlets-functional/pre-py3.yaml

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

@@ -8,8 +8,7 @@ coverage>=3.6
 nose
 pexpect
 python-subunit>=0.0.18
-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
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 openstackdocstheme>=1.11.0 # Apache-2.0
 oslotest>=1.2.0  # Apache-2.0
 stestr>=2.0.0 # Apache-2.0

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
-envlist = py27,py37,pep8
+minversion = 3.1.1
+envlist = py37,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} -U {opts} {packages}
 setenv =
@@ -24,7 +26,6 @@ whitelist_externals = bash
                       rm
 
 [testenv:pep8python]
-basepython = python3
 commands =
   flake8
   flake8 --filename=* bin --exclude=bin/*.sh
@@ -38,8 +39,7 @@ commands =
 basepython = python3.7
 commands = {[testenv:py36]commands}
 
-[testenv:func]
-basepython = python2.7
+[testenv:func-py3]
 deps =
   -r{toxinidir}/test-requirements.txt
   git+git://github.com/openstack/swift.git
@@ -49,23 +49,10 @@ setenv =
    CLUSTER_CONF_DIR={toxinidir}
 commands = {toxinidir}/.functests jenkins
 
-[testenv:func-py3]
-basepython = python3
-deps =
-  -r{toxinidir}/test-requirements.txt
-  git+git://github.com/openstack/swift.git
-setenv =
-   VIRTUAL_ENV={envdir}
-   STORLET_SAMPLE_PATH={toxinidir}/StorletSamples
-   CLUSTER_CONF_DIR={toxinidir}
-commands = {[testenv:func]commands}
-
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
    {[testenv]setenv}
    PYTHON=coverage run --source storlets --parallel-mode
@@ -76,15 +63,12 @@ commands =
    coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:bashate]
-basepython = python3
 # Run bashate check for all bash scripts
 # Ignores the following rules:
 #   E003: Indent not multiple of 4 (we prefer to use multiples of 2)
@@ -108,7 +92,6 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 
 [testenv:pep8]
-basepython = python3
 commands =
   {[testenv:pep8python]commands}
   {[testenv:bashate]commands}
@@ -116,5 +99,4 @@ passenv =
   HOME
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -W -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html