Add coverage job for qinling and python-qinlingclient

Also create 'qinling' queue that will be used by qinling and
python-qinlingclient and also qinling-tempest-plugin repo in future as well.

Story: 2001595
Task: 6546
Change-Id: I6b98cec8bba2aa6fcfb6711a609461dcd75cba48

zuul.d/projects.yaml

@@ -13792,6 +13792,12 @@
       - check-requirements
       - publish-to-pypi
       - publish-openstack-sphinx-docs
+    check:
+      jobs:
+        - openstack-tox-cover:
+            voting: false
+    gate:
+      queue: qinling
 
 - project:
     name: openstack/python-redfish
@@ -14072,6 +14078,12 @@
       - openstack-python35-jobs
       - check-requirements
       - publish-openstack-sphinx-docs
+    check:
+      jobs:
+        - openstack-tox-cover:
+            voting: false
+    gate:
+      queue: qinling
 
 - project:
     name: openstack/quark