Support compute microversion 2.94

The only thing that changes in 2.94 is server-side validation of the
``hostname`` parameter, so strictly speaking no client-side changes
are needed. We can still improve the help text for --hostname to
explain the differences between microversions, and add a functional
test to exercise the new microversion.

Change-Id: Id1049965150c46fe972733d6194b78d996c6e5d3
Signed-off-by: Artom Lifshitz <alifshit@redhat.com>
Co-authored-by: Stephen Finucane <stephenfin@redhat.com>

Author: notartom

openstackclient/compute/v2/server.py

@@ -1563,8 +1563,10 @@ def get_parser(self, prog_name: str) -> argparse.ArgumentParser:
                 'If unset, a hostname will be automatically generated from '
                 'the server name. '
                 'A utility such as cloud-init is required to propagate the '
-                'hostname in the metadata service to the guest OS itself. '
-                '(supported by --os-compute-api-version 2.90 or above)'
+                'hostname in the metadata service to the guest OS itself '
+                '(hostnames supported by --os-compute-api-version 2.90 or '
+                'above, FQDNs supported by --os-compute-api-version 2.94 or '
+                'above)'
             ),
         )
         parser.add_argument(
@@ -3676,8 +3678,10 @@ def get_parser(self, prog_name: str) -> argparse.ArgumentParser:
             help=_(
                 'Hostname configured for the server in the metadata service. '
                 'A separate utility running in the guest is required to '
-                'propagate changes to this value to the guest OS itself. '
-                '(supported by --os-compute-api-version 2.90 or above)'
+                'propagate changes to this value to the guest OS itself '
+                '(hostnames supported by --os-compute-api-version 2.90 or '
+                'above, FQDNs supported by --os-compute-api-version 2.94 or '
+                'above)'
             ),
         )
         parser.add_argument(
@@ -4673,8 +4677,10 @@ def get_parser(self, prog_name: str) -> argparse.ArgumentParser:
             help=_(
                 'Hostname configured for the server in the metadata service. '
                 'A separate utility running in the guest is required to '
-                'propagate changes to this value to the guest OS itself. '
-                '(supported by --os-compute-api-version 2.90 or above)'
+                'propagate changes to this value to the guest OS itself '
+                '(hostnames supported by --os-compute-api-version 2.90 or '
+                'above, FQDNs supported by --os-compute-api-version 2.94 or '
+                'above)'
             ),
         )
         return parser