Add pagination helpers

Add some pagination helpers to configure pagination parameters for
various commands. Two pagination schemes are supported, based on what we
currently support across OSC commands: marker-based pagination and
offset-based pagination.

Change-Id: I551bb4c3ff0568c6df5244a1d0f0669497bee58f
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

openstackclient/compute/v2/keypair.py

@@ -27,6 +27,7 @@ from osc_lib.command import command
 from osc_lib import exceptions
 from osc_lib import utils
 
+from openstackclient.common import pagination
 from openstackclient.i18n import _
 from openstackclient.identity import common as identity_common
 
@@ -296,15 +297,7 @@ class ListKeypair(command.Lister):
             ),
         )
         identity_common.add_project_domain_option_to_parser(parser)
-        parser.add_argument(
-            '--marker',
-            help=_('The last keypair ID of the previous page'),
-        )
-        parser.add_argument(
-            '--limit',
-            type=int,
-            help=_('Maximum number of keypairs to display'),
-        )
+        pagination.add_marker_pagination_option_to_parser(parser)
         return parser
 
     def take_action(self, parsed_args):