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

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

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

Update boto,pbr minimal requirement for python3 support.

Change-Id: I23c273d0aa57e1400b383357883f298b8288897d

.zuul.yaml

@@ -2,7 +2,6 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - publish-to-pypi

doc/requirements.txt

@@ -1,4 +1,3 @@
 openstackdocstheme>=1.11.0 # Apache-2.0
-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
 sphinxcontrib-httpdomain>=1.7.0

lower-constraints.txt

@@ -1,7 +1,7 @@
-boto==2.13.3
+boto==2.32.1
 hacking==0.9.0
 mock==1.0
-pbr==0.8
+pbr==2.0.0
 psutil==1.1.1
 six==1.9.0
 stestr==2.0.0

requirements.txt

@@ -1,4 +1,4 @@
-pbr!=2.1.0,>=0.8
-boto>=2.13.3
+pbr!=2.1.0,>=2.0.0
+boto>=2.32.1
 psutil>=1.1.1
 six>=1.9.0

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = http://www.openstack.org/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,8 +14,6 @@ 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
@@ -29,18 +28,3 @@ scripts =
     bin/cfn-init
     bin/cfn-push-stats
     bin/cfn-signal
-
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
-[wheel]
-universal = 1
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html

setup.py

@@ -18,5 +18,5 @@
 import setuptools
 
 setuptools.setup(
-    setup_requires=['pbr'],
+    setup_requires=['pbr>=2.0.0'],
     pbr=True)

tox.ini

@@ -1,20 +1,20 @@
 [tox]
-envlist = py27,py37,pep8
+envlist = py37,pep8
+ignore_basepython_conflict = true
 
 [testenv]
+basepython = python3
 setenv = VIRTUAL_ENV={envdir}
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
-deps = -r{toxinidir}/requirements.txt
+deps =-c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
            flake8 --filename=cfn-* bin
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source heat_cfntools --parallel-mode
@@ -25,7 +25,6 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]
@@ -33,12 +32,10 @@ show-source = true
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/requirements.txt