Dropping the py35 testing

All the integration testing has been moved to
Bionic now[1] and py3.5 is not tested runtime for
Train or stable/stein[2].

As per below ML thread, we are good to drop the py35
testing now:
http://lists.openstack.org/pipermail/openstack-discuss/2019-April/005097.html

[1] http://lists.openstack.org/pipermail/openstack-discuss/2019-April/004647.html
[2]
https://governance.openstack.org/tc/reference/runtimes/stein.html
https://governance.openstack.org/tc/reference/runtimes/train.html

Change-Id: I1874f96f78cb403e6f3a56a49cb83df40d531f8d

.zuul.yaml

@@ -19,23 +19,23 @@
       bindep_profile: rabbit
 
 - job:
-    name: oslo.messaging-tox-py35-func-amqp1
+    name: oslo.messaging-tox-py36-func-amqp1
-    parent: openstack-tox-py35
+    parent: openstack-tox-py36
     vars:
-      tox_envlist: py35-func-amqp1
+      tox_envlist: py36-func-amqp1
 
 - job:
-    name: oslo.messaging-tox-py35-func-kafka
+    name: oslo.messaging-tox-py36-func-kafka
-    parent: openstack-tox-py35
+    parent: openstack-tox-py36
     vars:
-      tox_envlist: py35-func-kafka
+      tox_envlist: py36-func-kafka
       bindep_profile: kafka
 
 - job:
-    name: oslo.messaging-tox-py35-func-rabbit
+    name: oslo.messaging-tox-py36-func-rabbit
-    parent: openstack-tox-py35
+    parent: openstack-tox-py36
     vars:
-      tox_envlist: py35-func-rabbit
+      tox_envlist: py36-func-rabbit
       bindep_profile: rabbit
 
 # Begin v3 native jobs
@@ -232,11 +232,11 @@
             voting: false
         - oslo.messaging-tox-py27-func-kafka:
             voting: false
-        - oslo.messaging-tox-py35-func-rabbit:
+        - oslo.messaging-tox-py36-func-rabbit:
             voting: false
-        - oslo.messaging-tox-py35-func-amqp1:
+        - oslo.messaging-tox-py36-func-amqp1:
             voting: false
-        - oslo.messaging-tox-py35-func-kafka:
+        - oslo.messaging-tox-py36-func-kafka:
             voting: false
 
         - oslo.messaging-src-dsvm-full-rabbit

setup.cfg

@@ -16,7 +16,7 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
 
 [extras]
 # package dependencies for optional (non-rabbitmq) messaging drivers.

tox.ini

@@ -48,8 +48,8 @@ setenv =
     TRANSPORT_DRIVER=rabbit
 commands = pifpaf run rabbitmq --  stestr run --slowest {posargs:oslo_messaging.tests.functional}
 
-[testenv:py35-func-rabbit]
+[testenv:py36-func-rabbit]
-basepython = python3.5
+basepython = python3.6
 setenv =
     {[testenv]setenv}
     TRANSPORT_DRIVER=rabbit
@@ -73,8 +73,8 @@ setenv =
     WORKDIR={toxworkdir}
 commands = {toxinidir}/tools/setup-test-env-amqp1.sh stestr run --slowest {posargs:oslo_messaging.tests.functional}
 
-[testenv:py35-func-amqp1]
+[testenv:py36-func-amqp1]
-basepython = python3.5
+basepython = python3.6
 setenv =
     {[testenv]setenv}
     TRANSPORT_URL=amqp://stackqpid:secretqpid@127.0.0.1:65123//
@@ -83,8 +83,8 @@ setenv =
     WORKDIR={toxworkdir}
 commands = {toxinidir}/tools/setup-test-env-amqp1.sh stestr run --slowest {posargs:oslo_messaging.tests.functional}
 
-[testenv:py35-func-kafka]
+[testenv:py36-func-kafka]
-basepython = python3.5
+basepython = python3.6
 setenv =
     {[testenv]setenv}
     TRANSPORT_URL=kafka://127.0.0.1:9092/