Drop py35 jobs

Python 3.5 was the target runtime for the Rocky release. The current
target py3 runtime for Stein is Python 3.6, so there is no reason to
keep testing against the older version.

https://governance.openstack.org/tc/reference/runtimes/stein.html#python-runtime-for-stein

Change-Id: If810570859e4c4a942f44097717170d5a0affbd0
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

.zuul.yaml

@@ -2,7 +2,6 @@
     templates:
       - openstack-lower-constraints-jobs
       - openstack-python-jobs
-      - openstack-python35-jobs
       - openstack-python36-jobs
       - publish-openstack-docs-pti
       - periodic-stable-jobs
@@ -15,7 +14,7 @@
         - cinder-tempest-dsvm-lvm-lio-barbican
         - cinder-tox-bandit-baseline:
             voting: false
-        - openstack-tox-functional-py35:
+        - openstack-tox-functional-py36:
             irrelevant-files: &functional-irrelevant-files
               - ^.*\.rst$
               - ^api-ref/.*$
@@ -25,7 +24,6 @@
               - ^contrib/block-box.*$
               - ^doc/.*$
               - ^releasenotes/.*$
-        - openstack-tox-functional-py36
         - cinder-rally-task:
             voting: false
         - openstack-tox-pylint:
@@ -71,8 +69,6 @@
             irrelevant-files: *gate-irrelevant-files
     gate:
       jobs:
-        - openstack-tox-functional-py35:
-            irrelevant-files: *functional-irrelevant-files
         - legacy-grenade-dsvm-cinder-mn-sub-volbak:
             irrelevant-files: *gate-irrelevant-files
         - neutron-grenade:

tox.ini

@@ -2,7 +2,7 @@
 minversion = 2.0
 skipsdist = True
 skip_missing_interpreters = true
-envlist = py36,py35,py27,compliance,pep8
+envlist = py36,py27,compliance,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
@@ -53,12 +53,6 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 setenv =
   OS_TEST_PATH = ./cinder/tests/functional
 
-[testenv:functional-py35]
-basepython=
-    py35: python3.5
-setenv =
-  {[testenv:functional]setenv}
-
 [testenv:functional-py36]
 setenv =
   {[testenv:functional]setenv}