[ci] Switch generic driver job to focal fossa

There is one failing test. See bug #1903922 - this failure
is observed on older versions of Ubuntu as well, and doesn't
seem to be an artifact of changing the underlying OS.

Change-Id: Ifb3cb87512c3d8f7cf3af44f7012b967d502bd8e
Partial-Bug: #1896672
Related-Bug: #1903922
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
diff --git a/zuul.d/manila-tempest-jobs.yaml b/zuul.d/manila-tempest-jobs.yaml
index 05d2984..9f15e08 100644
--- a/zuul.d/manila-tempest-jobs.yaml
+++ b/zuul.d/manila-tempest-jobs.yaml
@@ -262,12 +262,6 @@
     description: |
       Test the generic driver multibackend (DHSS=True) with NFS and CIFS
     parent: manila-tempest-plugin-base
-    # TODO(gmann): Remove the below nodeset setting to Bionic once
-    # https://bugs.launchpad.net/manila/+bug/1896672 is fixed
-    # Once nodeset is removed form here then devstack base job
-    # will automatically run this job on Ubuntu Focal nodeset from
-    # Victoria gate onwards.
-    nodeset: openstack-single-node-bionic
     vars:
       tempest_test_regex: '(^manila_tempest_tests.tests)(?=.*\[.*\bbackend\b.*\])'
       # The generic driver uses nova VMs as share servers; running with a