Add --marker option to "server list" command.

This option will give user a chance to display the server list
from wherever they want.

Change-Id: I92cca5e98cd473f1113a9106eb9d1f490694b1fe

Author: tang-chen

doc/source/command-objects/server.rst

@@ -187,6 +187,7 @@ List servers
         [--all-projects]
         [--project <project> [--project-domain <project-domain>]]
         [--long]
+        [--marker <server>]
 
 .. option:: --reservation-id <reservation-id>
 
@@ -250,6 +251,11 @@ List servers
 
     List additional fields in output
 
+.. option:: --marker <server>
+
+    The last server (name or ID) of the previous page. Display list of servers
+    after marker. Display all servers if not specified.
+
 server lock
 -----------
 

openstackclient/compute/v2/server.py

@@ -747,6 +747,14 @@ def get_parser(self, prog_name):
             default=False,
             help=_('List additional fields in output'),
         )
+        parser.add_argument(
+            '--marker',
+            metavar='<marker>',
+            default=None,
+            help=('The last server (name or ID) of the previous page. Display'
+                  ' list of servers after marker. Display all servers if not'
+                  ' specified.')
+        )
         return parser
 
     @utils.log_method(log)
@@ -830,7 +838,14 @@ def take_action(self, parsed_args):
                 'Networks',
             )
             mixed_case_fields = []
-        data = compute_client.servers.list(search_opts=search_opts)
+
+        marker_id = None
+        if parsed_args.marker:
+            marker_id = utils.find_resource(compute_client.servers,
+                                            parsed_args.marker).id
+
+        data = compute_client.servers.list(search_opts=search_opts,
+                                           marker=marker_id)
         return (column_headers,
                 (utils.get_item_properties(
                     s, columns,