nova: Release Train 20.4.1

$ git log --oneline --no-merges 20.4.0..HEAD
115b43ed3e Follow up for cherry-pick check for merge patch
750655c19d Allow tap interface with multiqueue
75c0327a67 Set different VirtualDevice.key
1634d3f59a api: Set min, maxItems for server_group.policies field
cf6db29168 tests: Add regression test for bug 1894966
efc35b1c52 Sanity check instance mapping during scheduling
4984b3b75b Correctly disable greendns
06df7cae31 Removes the delta file once image is extracted
7ace26e4bc post live migration: don't call Neutron needlessly
d92fe4f3e6 libvirt:driver:Disallow AIO=native when 'O_DIRECT' is not available
ed9eacff92 Add note and daxio version to the vPMEM document
bbc562c572 compute: Validate a BDMs disk_bus when provided
c5abbd17b5 Removed the host FQDN from the exception message
683005df39 Add checks for volume status when rebuilding
c6c3483a41 compute: Don't delete the original attachment during pre LM rollback
377dc5bda9 compute: refactor volume bdm rollback error handling
6a9bb79fc0 Add regression tests for bug #1889108
44676ddf84 hardware: Reject requests for no hyperthreads on hosts with HT
b60be4a941 tests: Add reproducer for bug #1889633

Change-Id: I18e828a68fdf706f934db932baf5cf01c9b45fbc

deliverables/train/nova.yaml

@@ -87,6 +87,10 @@ releases:
     projects:
       - repo: openstack/nova
         hash: 6f24f0f5d87447ed6b6fd6b95a5eb969a82880ee
+  - version: 20.4.1
+    projects:
+      - repo: openstack/nova
+        hash: 5016a36d25de30c78dce3f3a9a247335de286039
 branches:
   - name: stable/train
     location: 20.0.0.0rc1