Drop python 2.7 support and testing

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

ironic-lib 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: Idfa5afedb607c99c34ff4a07594f698c9bd3bed8

releasenotes/notes/drop-py-2-7-3c01e37309077c06.yaml

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

requirements.txt

@@ -12,5 +12,4 @@ oslo.utils>=3.33.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 six>=1.10.0 # MIT
 oslo.log>=3.36.0 # Apache-2.0
-zeroconf>=0.19.1,<0.20;python_version=='2.7' # LGPL
 zeroconf>=0.19.1;python_version>='3.0' # LGPL

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

@@ -14,6 +14,5 @@ testtools>=2.2.0 # MIT
 
 # Doc requirements
 doc8>=0.6.0 # 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,>=1.6.2;python_version>='3.4'  # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 1.8
 skipsdist = True
-envlist = py3,py27,pep8
+envlist = py3,pep8
 
 [testenv]
+basepython = python3
 install_command = pip install {opts} {packages}
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
@@ -31,13 +32,11 @@ application-import-names = ironic_lib
 enable-extensions=H106,H203,H204,H205,H210,H904
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 {posargs}
     doc8 README.rst doc/source --ignore D001
 
 [testenv:cover]
-basepython = python3
 setenv = VIRTUALENV={envdir}
          LANGUAGE=en_US
          PYTHON=coverage run --source ironic_lib --omit='*tests*' --parallel-mode
@@ -49,11 +48,9 @@ commands =
   coverage html -d ./cover --omit='*tests*'
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:docs]
-basepython = python3
 setenv = PYTHONHASHSEED=0
 sitepackages = False
 envdir = {toxworkdir}/venv
@@ -70,7 +67,6 @@ commands = sphinx-build -b latex doc/source doc/build/pdf
            make -C doc/build/pdf
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt

zuul.d/ironic-lib-jobs.yaml

@@ -34,14 +34,6 @@
         SWIFT_ENABLE_TEMPURLS: True
         SWIFT_TEMPURL_KEY: secretkey
 
-- job:
-    name: ironic-lib-wholedisk-bios-ipmi-direct-tinyipa-src-python2
-    parent: ironic-lib-wholedisk-bios-ipmi-direct-tinyipa-src
-    timeout: 7200
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: False
-
 - job:
     name: ironic-lib-partition-bios-ipmi-direct-tinyipa-src
     parent: ironic-lib-base
@@ -57,28 +49,12 @@
         SWIFT_ENABLE_TEMPURLS: True
         SWIFT_TEMPURL_KEY: secretkey
 
-- job:
-    name: ironic-lib-partition-bios-ipmi-direct-tinyipa-src-python2
-    parent: ironic-lib-partition-bios-ipmi-direct-tinyipa-src
-    timeout: 7200
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: False
-
-
 - job:
     name: ironic-lib-partition-bios-ipmi-iscsi-tinyipa-src
     parent: ironic-lib-base
     timeout: 7200
 
 
-- job:
-    name: ironic-lib-partition-bios-ipmi-iscsi-tinyipa-src-python2
-    parent: ironic-lib-base
-    timeout: 7200
-    vars:
-        USE_PYTHON3: False
-
 - job:
     name: ironic-lib-wholedisk-bios-ipmi-iscsi-tinyipa-src
     parent: ironic-lib-base

zuul.d/project.yaml

@@ -3,26 +3,19 @@
       - check-requirements
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
     check:
       jobs:
-        - ironic-lib-wholedisk-bios-ipmi-direct-tinyipa-src-python2
         - ironic-lib-wholedisk-bios-ipmi-direct-tinyipa-src
-        - ironic-lib-partition-bios-ipmi-direct-tinyipa-src-python2
         - ironic-lib-partition-bios-ipmi-direct-tinyipa-src
-        - ironic-lib-partition-bios-ipmi-iscsi-tinyipa-src-python2
         - ironic-lib-partition-bios-ipmi-iscsi-tinyipa-src
         - ironic-lib-wholedisk-bios-ipmi-iscsi-tinyipa-src
     gate:
       queue: ironic
       jobs:
-        - ironic-lib-wholedisk-bios-ipmi-direct-tinyipa-src-python2
         - ironic-lib-wholedisk-bios-ipmi-direct-tinyipa-src
-        - ironic-lib-partition-bios-ipmi-direct-tinyipa-src-python2
         - ironic-lib-partition-bios-ipmi-direct-tinyipa-src
-        - ironic-lib-partition-bios-ipmi-iscsi-tinyipa-src-python2
         - ironic-lib-partition-bios-ipmi-iscsi-tinyipa-src
         - ironic-lib-wholedisk-bios-ipmi-iscsi-tinyipa-src
     post: