Update Zuul job configuration

check and gate queue needs to test the same environment. Remove
the required-projects from check queue.

Add openstack-lower-constraints-jobs to templates.

This removes also the jobs from the Zuul, they are part of the existing
templates and are still run.

Remove tripleo-ci-centos-7-undercloud-containers job, change
Ie94e03bdcc14918eb4095e9581d4a935a59b0d6b changed that to
tripleo-ci-centos-7-containers-multinode but missed the gate one. Since
it's non-voting, remove it from gate.

Change-Id: I5e0fee3a85ff7eeacb2503295da70abbfcf62b49

.zuul.yaml

@@ -95,6 +95,7 @@
       - publish-openstack-docs-pti
       - check-requirements
       - release-notes-jobs-python3
+      - openstack-lower-constraints-jobs
     check:
       jobs:
         - openstack-tox-cover:
@@ -104,25 +105,6 @@
               - ^.*\.rst$
               - ^doc/.*$
               - ^releasenotes/.*$
-            required-projects:
-              - openstack/mistral-lib
-              - openstack/mistral-extra
-        - openstack-tox-py36:
-            required-projects:
-              - openstack/mistral-lib
-              - openstack/mistral-extra
-        - openstack-tox-py37:
-            required-projects:
-              - openstack/mistral-lib
-              - openstack/mistral-extra
-        - openstack-tox-py38:
-            required-projects:
-              - openstack/mistral-lib
-              - openstack/mistral-extra
-        - openstack-tox-docs:
-            required-projects:
-              - openstack/mistral-lib
-              - openstack/mistral-extra
         - mistral-devstack
         - mistral-devstack-tempest-ipv6-only
         - mistral-devstack-non-apache-tempest-ipv6-only
@@ -139,10 +121,6 @@
             voting: false
         - mistral-rally-task:
             voting: false
-        - openstack-tox-lower-constraints:
-            required-projects:
-              - openstack/mistral-lib
-              - openstack/mistral-extra
     gate:
       queue: mistral
       jobs:
@@ -150,11 +128,9 @@
         - mistral-devstack-tempest-ipv6-only
         - mistral-devstack-non-apache-tempest-ipv6-only
         - mistral-devstack-non-apache
+        - mistral-devstack-kombu
         - mistral-tox-unit-mysql
         - mistral-tox-unit-postgresql
-        - mistral-devstack-kombu
-        - openstack-tox-lower-constraints
-        - tripleo-ci-centos-7-undercloud-containers
     post:
       jobs:
         - mistral-docker-buildimage: