Skip tests when service barbican is enabled

We should not execute this tests because limitation of Nova when
Barbican service is enabled, unshelve will not work

List of skipped tests:
tempest.api.compute.servers.test_server_actions.ServerActionsTestJSON.test_shelve_unshelve_server
tempest.api.compute.servers.test_servers_negative.ServersNegativeTestJSON.test_shelve_shelved_server
tempest.api.compute.volumes.test_attach_volume.AttachVolumeShelveTestJSON.test_attach_volume_shelved_or_offload_server
tempest.api.compute.volumes.test_attach_volume.AttachVolumeShelveTestJSON.test_detach_volume_shelved_or_offload_server
tempest.scenario.test_shelve_instance.TestShelveInstance.test_shelve_instance

Change-Id: I1d0b5d0920a4d076d39c8cdf68f4b81ba1e43025
Related-prod: PROD-23562
4 files changed