Move py35 jobs to latest python3

glanceclient-tox-py35-keystone-tips and glanceclient-tox-py35-oslo-tips
jobs run on py35 which should be moved the newer python3 version.

Moving them to py3 env so that they can pickup the available
python version on running node.

Change-Id: I5fadbadf9eee2163ef6d17af2ceb49883151038c

.zuul.yaml

@@ -94,12 +94,12 @@
       - name: openstack/keystoneauth
 
 - job:
-    name: glanceclient-tox-py35-keystone-tips
+    name: glanceclient-tox-py3-keystone-tips
     parent: glanceclient-tox-keystone-tips-base
     description: |
-      glanceclient py35 unit tests vs. keystone masters
+      glanceclient py3 unit tests vs. keystone masters
     vars:
-      tox_envlist: py35
+      tox_envlist: py3
 
 - job:
     name: glanceclient-tox-oslo-tips-base
@@ -111,12 +111,12 @@
       - name: openstack/oslo.utils
 
 - job:
-    name: glanceclient-tox-py35-oslo-tips
+    name: glanceclient-tox-py3-oslo-tips
     parent: glanceclient-tox-oslo-tips-base
     description: |
-      glanceclient py35 unit tests vs. oslo masters
+      glanceclient py3 unit tests vs. oslo masters
     vars:
-      tox_envlist: py35
+      tox_envlist: py3
 
 - job:
     name: glanceclient-dsvm-functional-py3
@@ -157,9 +157,9 @@
         # to define these jobs in the openstack/project-config repo.
         # That would make us less agile in adjusting these tests, so we
         # aren't doing that either.
-        - glanceclient-tox-py35-keystone-tips:
+        - glanceclient-tox-py3-keystone-tips:
             branches: master
-        - glanceclient-tox-py35-oslo-tips:
+        - glanceclient-tox-py3-oslo-tips:
             branches: master
     experimental:
       jobs: