Drop python 2.7 support and testing

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

Networking Baremetal 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://review.opendev.org/#/c/691178/

Change-Id: I7f08a871ba82081f6164f84f05f50eb61cfd7541

releasenotes/notes/drop-py-2-7-2249129e616bb1e5.yaml

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

test-requirements.txt

@@ -12,7 +12,6 @@ stestr>=1.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 
 # Doc requirements
-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
 

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
-envlist = py3,py27,pep8
+envlist = py3,pep8
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install {opts} {packages}
 setenv =
@@ -16,7 +17,6 @@ commands = stestr run {posargs}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:pep8]
-basepython = python3
 whitelist_externals = bash
 commands =
   bash tools/flake8wrap.sh {posargs}
@@ -25,11 +25,9 @@ commands =
   {toxinidir}/tools/run_bashate.sh {toxinidir}/devstack
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv = VIRTUAL_ENV={envdir}
          LANGUAGE=en_US
          PYTHON=coverage run --source networking_baremetal --parallel-mode
@@ -42,14 +40,12 @@ commands =
     coverage report --omit='*test*'
 
 [testenv:docs]
-basepython = python3
 setenv = PYTHONHASHSEED=0
 sitepackages = False
 commands =
   python setup.py build_sphinx
 
 [testenv:pdf-docs]
-basepython = python3
 whitelist_externals = make
 setenv = PYTHONHASHSEED=0
 sitepackages = False
@@ -58,17 +54,14 @@ commands =
   make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:genconfig]
-basepython = python3
 commands =
   oslo-config-generator --config-file=tools/config/networking-baremetal-config-generator.conf
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper -t networking_baremetal/tests/unit {posargs}
 
 [flake8]
@@ -80,7 +73,6 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt

zuul.d/project.yaml

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