Run Grenade job under Python 2 for compatibility

1. Run Grenade job under Python 2 for compatibility
2. Temporary mark telemetry-dsvm-integration non-voting
3. Remove telemter py37 due to use fedora nodeset

Change-Id: I3289c3bf085fd5fd8f40074bd885f30375b2d50b

.zuul.yaml

@@ -9,20 +9,6 @@
       - openstack/devstack-gate
       - openstack/ceilometer
 
-- job:
-    name: telemetry-tox-py37
-    parent: openstack-tox
-    timeout: 2400
-    irrelevant-files:
-      - ^.*\.rst$
-      - ^api-ref/.*$
-      - ^doc/.*$
-      - ^releasenotes/.*$
-    vars:
-      tox_envlist: py37
-      bindep_profile: test py37
-    nodeset: fedora-latest
-
 - project:
     templates:
       - openstack-python-jobs
@@ -32,22 +18,38 @@
       - release-notes-jobs
     check:
       jobs:
-        - telemetry-tox-py37
         - openstack-tox-cover
         - grenade-dsvm-ceilometer:
             irrelevant-files:
               - ^(test-|)requirements.txt$
               - ^setup.cfg$
-        - telemetry-dsvm-integration
+              - ^reno.yaml$
+        - telemetry-dsvm-integration:
+            voting: false
+            irrelevant-files:
+              - ^(test-|)requirements.txt$
+              - ^setup.cfg$
+              - ^reno.yaml$
+              - ^doc/.*$
+              - ^.*\.rst$
+              - ^releasenotes/.*$
     gate:
       queue: telemetry
       jobs:
-        - telemetry-tox-py37
         - grenade-dsvm-ceilometer:
             irrelevant-files:
               - ^(test-|)requirements.txt$
               - ^setup.cfg$
-        - telemetry-dsvm-integration
+              - ^reno.yaml$
+        - telemetry-dsvm-integration:
+            voting: false
+            irrelevant-files:
+              - ^(test-|)requirements.txt$
+              - ^setup.cfg$
+              - ^reno.yaml$
+              - ^doc/.*$
+              - ^.*\.rst$
+              - ^releasenotes/.*$
     experimental:
       jobs:
         # TripleO jobs that deploy Telemetry.

playbooks/legacy/grenade-dsvm-ceilometer/run.yaml

@@ -31,6 +31,7 @@
           export PYTHONUNBUFFERED=true
           export DEVSTACK_GATE_TEMPEST=1
           export DEVSTACK_GATE_GRENADE=pullup
+          export DEVSTACK_GATE_USE_PYTHON3=False
           export BRANCH_OVERRIDE=default
           if [ "$BRANCH_OVERRIDE" != "default" ] ; then
               export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE