set default python to python3

Set the default python to python3 except for the py27 specific test
environments. Set Python 2.7 as the python version to use for these
tests.

Temporarily ignore optional driver requirements for now. This will be
addressed in a later update.

Change-Id: Iea8e48b72234bb9a580f2345396cf60fe2022618

tox.ini

@@ -3,6 +3,7 @@ minversion = 2.0
 envlist = py35,py27,pep8,bandit
 
 [testenv]
+basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
 passenv = OS_*
@@ -15,6 +16,9 @@ deps =
   -r{toxinidir}/requirements.txt
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
+[testenv:py27]
+basepython = python2.7
+
 [testenv:pep8]
 commands = flake8
 deps = hacking<0.11,>=0.10.0
@@ -32,6 +36,7 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:py27-func-rabbit]
+basepython = python2.7
 setenv =
     {[testenv]setenv}
     TRANSPORT_DRIVER=rabbit
@@ -41,10 +46,10 @@ commands = pifpaf run rabbitmq --  python setup.py testr --slowest --testr-args=
 setenv =
     {[testenv]setenv}
     TRANSPORT_DRIVER=rabbit
-basepython = python3.5
 commands = pifpaf run rabbitmq --  python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py27-func-kafka]
+basepython = python2.7
 setenv =
     {[testenv]setenv}
     TRANSPORT_URL=kafka://127.0.0.1:9092/
@@ -52,6 +57,7 @@ setenv =
 commands = {toxinidir}/setup-test-env-kafka.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py27-func-amqp1]
+basepython = python2.7
 setenv =
     {[testenv]setenv}
     TRANSPORT_URL=amqp://stackqpid:secretqpid@127.0.0.1:65123//
@@ -61,7 +67,6 @@ setenv =
 commands = {toxinidir}/tools/setup-test-env-amqp1.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py35-func-amqp1]
-basepython = python3.5
 setenv =
     {[testenv]setenv}
     TRANSPORT_URL=amqp://stackqpid:secretqpid@127.0.0.1:65123//
@@ -71,18 +76,22 @@ setenv =
 commands = {toxinidir}/tools/setup-test-env-amqp1.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py27-func-zmq]
+basepython = python2.7
 commands = {toxinidir}/setup-test-env-zmq.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py35-func-zmq]
 commands = {toxinidir}/setup-test-env-zmq.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py27-func-zmq-dyn]
+basepython = python2.7
 commands = {toxinidir}/setup-test-env-zmq-direct-dynamic.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py27-func-zmq-proxy]
+basepython = python2.7
 commands = {toxinidir}/setup-test-env-zmq-proxy.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:py27-func-zmq-pubsub]
+basepython = python2.7
 commands = {toxinidir}/setup-test-env-zmq-pub-sub.sh python setup.py testr --slowest --testr-args='{posargs:oslo_messaging.tests.functional}'
 
 [testenv:bandit]
@@ -108,9 +117,14 @@ local-check-factory = oslo_messaging.hacking.checks.factory
 # do not install test-requirements as that will pollute the virtualenv for
 # determining missing packages
 # this also means that pip-missing-reqs must be installed separately, outside
-# of the requirements.txt files
+# of the requirements.txt files.
+# Ignore optional driver components for now (see https://review.openstack.org/#/c/525319/)
 deps = pip_check_reqs
-commands = pip-missing-reqs -d --ignore-module=oslo_messaging* --ignore-file=oslo_messaging/tests/* --ignore-file=tests/ oslo_messaging
+commands = pip-missing-reqs -d --ignore-module=oslo_messaging* \
+                            --ignore-file=oslo_messaging/tests/* \
+                            --ignore-file=oslo_messaging/_drivers/zmq_driver/* \
+                            --ignore-file=oslo_messaging/_drivers/impl_kafka.py \
+                            --ignore-file=tests/ oslo_messaging
 
 [testenv:releasenotes]
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
@@ -121,7 +135,6 @@ deps = bindep
 commands = bindep {posargs}
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt