Minor update fails on ceph storage nodes when using overcloud-minimal images

Issue

• Minor update fails on ceph storage nodes when using overcloud-minimal images with an error similar to this one:

TASK [Ensure openvswitch is running after update] ******************************
Friday 24 April 2020  15:39:31 +0200 (0:01:04.011)       0:01:47.491 **********
fatal: [overcloud-ceph-0]: FAILED! => {"changed": false, "msg": "Could not find the requested service openvswitch: host"}