nova: Release 19.2.0

As with 20.2.0 on stable/train this stable/stein release also sees a
minor version bump due to the inclusion of API behavioural change
bugfixes (6e71909b0b) and new configurables (a96e7ab830).

$ git log --oneline --no-merges 19.1.0..HEAD
6e71909b0b Reject boot request for unsupported images
b3afe74833 Make RBD imagebackend flatten method idempotent
a96e7ab830 Add config option for neutron client retries
4de766006d Reset the cell cache for databaseaccess in Service
7df3d9fbb9 Use placement stable version for functional job
265fd4f6bd Unplug VIFs as part of cleanup of networks
ff21016543 Functional test for UnexpectedDeletingTaskStateError
e7cd8b49e2 nova-live-migration: Ensure subnode is fenced during evacuation testing
8f8667a8dd Lowercase ironic driver hash ring and ignore case in cache
373c4ffde2 nova-live-migration: Wait for n-cpu services to come up after configuring Ceph
763b7897f4 Fix intermittently failing regression case
85052c055f Fix os-keypairs pagination links
9030b8a56d Fix hypervisors paginted collection_name.
405a35587a Clean up allocation if unshelve fails due to neutron
f960d1751d Reproduce bug 1862633
4700b3658e libvirt: Ignore DiskNotFound during update_available_resource
f5bc2c7ae4 libvirt: Provide the backing file format when creating qcow2 disks
b874c409c1 Enhance service restart in functional env

Change-Id: I3b85ef00dea4ac288ef061d690dc6780210091ec

deliverables/stein/nova.yaml

@@ -60,6 +60,10 @@ releases:
       - hash: bf9d9e55e652012d16b9d052a37efc18abbf1a01
         repo: openstack/nova
     version: 19.1.0
+  - projects:
+      - hash: fb5c97492c390db7ac511e32f2b215c7d19e94dc
+        repo: openstack/nova
+    version: 19.2.0
 branches:
   - location: 19.0.0.0rc1
     name: stable/stein