Fix ec2-api gating job

1. Do not run tempest with own functional tests jobs.
It takes more time and don't allow to run fake-virt-rally job.
because scenarios' tests can't be passed with fake virt.
This fix sets to DEVSTACK_GATE_TEMPEST_NOTESTS 1,
in conjunction with DEVSTACK_GATE_TEMPEST. It will allow Tempest to be
installed and configured, but the tests will be skipped

2. Temporary switch off voting for tempest against ec2-api backend.
Current tempest has two incompatible tests -
diassociate_not_associated_address
and run instance by image/kernel/ramdisk(This feature
is broken in current nova code as I understood)

Change-Id: I7bad03ffb5e4fa3bc13457dc18bde7040458aa78

jenkins/jobs/ec2-api.yaml

@@ -60,6 +60,7 @@
           export PYTHONUNBUFFERED=true
           export DEVSTACK_GATE_TIMEOUT=120
           export DEVSTACK_GATE_TEMPEST=1
+          export DEVSTACK_GATE_TEMPEST_NOTESTS=1
           export DEVSTACK_GATE_NEUTRON=1
           export BRANCH_OVERRIDE={branch-override}
           if [ "$BRANCH_OVERRIDE" != "default" ] ; then
@@ -100,6 +101,7 @@
           export PYTHONUNBUFFERED=true
           export DEVSTACK_GATE_TIMEOUT=120
           export DEVSTACK_GATE_TEMPEST=1
+          export DEVSTACK_GATE_TEMPEST_NOTESTS=1
           export DEVSTACK_GATE_NEUTRON=0
           export BRANCH_OVERRIDE={branch-override}
           if [ "$BRANCH_OVERRIDE" != "default" ] ; then
@@ -140,6 +142,7 @@
           export DEVSTACK_LOCAL_CONFIG="enable_plugin ec2-api git://git.openstack.org/stackforge/ec2-api"
           export DEVSTACK_GATE_VIRT_DRIVER=fake
           export DEVSTACK_GATE_NEUTRON=1
+          export DEVSTACK_GATE_TEMPEST_NOTESTS=1
           export DEVSTACK_GATE_TIMEOUT=120
 
           # Switch on tempest because m1.nano is created only for tempest...

zuul/layout.yaml

@@ -678,6 +678,7 @@ jobs:
     voting: false
   - name: check-tempest-dsvm-ec2api
     branch: ^(?!stable)
+    voting: false
   - name: check-functional-neutron-dsvm-ec2api
     branch: ^(?!stable)
   - name: check-functional-nova-network-dsvm-ec2api