[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

Change-Id: I15cc79159b603e232e442e202c78d6c56dc73252

.zuul.yaml

@@ -1,23 +1,3 @@
-- job:
-    name: oslo.messaging-tox-py27-func-amqp1
-    parent: openstack-tox-py27
-    vars:
-      tox_envlist: py27-func-amqp1
-
-- job:
-    name: oslo.messaging-tox-py27-func-kafka
-    parent: openstack-tox-py27
-    vars:
-      tox_envlist: py27-func-kafka
-      bindep_profile: kafka
-
-- job:
-    name: oslo.messaging-tox-py27-func-rabbit
-    parent: openstack-tox-py27
-    vars:
-      tox_envlist: py27-func-rabbit
-      bindep_profile: rabbit
-
 - job:
     name: oslo.messaging-tox-py36-func-amqp1
     parent: openstack-tox-py36
@@ -150,22 +130,15 @@
 - project:
     templates:
       - check-requirements
-      - lib-forward-testing
       - lib-forward-testing-python3
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - oslo.messaging-tox-py27-func-rabbit
-        - oslo.messaging-tox-py27-func-amqp1:
-            voting: false
-        - oslo.messaging-tox-py27-func-kafka:
-            voting: false
         - oslo.messaging-tox-py36-func-rabbit:
             voting: false
         - oslo.messaging-tox-py36-func-amqp1:
@@ -190,5 +163,5 @@
 
     gate:
       jobs:
-        - oslo.messaging-tox-py27-func-rabbit
+        - oslo.messaging-tox-py36-func-rabbit
         - oslo.messaging-src-dsvm-full-rabbit

doc/requirements.txt

@@ -3,8 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 openstackdocstheme>=1.20.0 # Apache-2.0
-sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
 reno>=2.5.0 # Apache-2.0
 
 # imported when the source code is parsed for generating documentation:

lower-constraints.txt

@@ -18,7 +18,6 @@ extras==1.0.0
 fasteners==0.7.0
 fixtures==3.0.0
 flake8==2.5.5
-futures==3.0.0;python_version=='2.7' or python_version=='2.6' # BSD
 futurist==1.2.0
 gitdb==0.6.4
 GitPython==1.0.1

releasenotes/notes/drop-python27-support-5ef2f365d8930483.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 2.7 has been dropped. The latest version of Python now
+    supported is Python 3.6.

setup.cfg

@@ -6,6 +6,7 @@ summary = Oslo Messaging API
 description-file =
     README.rst
 home-page = https://docs.openstack.org/oslo.messaging/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Developers
@@ -13,11 +14,11 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
     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
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: Implementation :: CPython
 
 [extras]
 # package dependencies for optional (non-rabbitmq) messaging drivers.
@@ -65,9 +66,6 @@ oslo.messaging.notify.drivers =
 oslo.config.opts =
     oslo.messaging = oslo_messaging.opts:list_opts
 
-[bdist_wheel]
-universal = 1
-
 [compile_catalog]
 directory = oslo_messaging/locale
 domain = oslo_messaging

setup.py

@@ -16,14 +16,6 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=2.0.0'],
     pbr=True)

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 3.1
-envlist = py27,py37,pep8
-ignore_basepython_conflict = True
+envlist = py37,pep8
+ignore_basepython_conflict = true
 
 [testenv]
 basepython = python3
@@ -42,33 +42,12 @@ commands =
   rm -fr doc/build
   sphinx-build -W --keep-going -b html doc/source doc/build/html
 
-[testenv:py27-func-rabbit]
-setenv =
-    {[testenv]setenv}
-    TRANSPORT_DRIVER=rabbit
-commands = pifpaf run rabbitmq --  stestr run --slowest {posargs:oslo_messaging.tests.functional}
-
 [testenv:py36-func-rabbit]
 setenv =
     {[testenv]setenv}
     TRANSPORT_DRIVER=rabbit
 commands = pifpaf run rabbitmq --  stestr run --slowest {posargs:oslo_messaging.tests.functional}
 
-[testenv:py27-func-kafka]
-setenv =
-    {[testenv]setenv}
-    TRANSPORT_URL=kafka://127.0.0.1:9092/
-    OS_GROUP_REGEX=oslo_messaging.tests.functional
-commands = {toxinidir}/setup-test-env-kafka.sh stestr run --slowest {posargs:oslo_messaging.tests.functional}
-
-[testenv:py27-func-amqp1]
-setenv =
-    {[testenv]setenv}
-    TRANSPORT_URL=amqp://stackqpid:secretqpid@127.0.0.1:5672//
-    ENVNAME={envname}
-    WORKDIR={toxworkdir}
-commands = {toxinidir}/tools/setup-test-env-amqp1.sh stestr run --slowest {posargs:oslo_messaging.tests.functional}
-
 [testenv:py36-func-amqp1]
 setenv =
     {[testenv]setenv}