Enable "openstack server unlock" command to take multiple servers.

Current "openstack server unlock" command could only unlock one server.
Improve it to be able to handle more than one servers. Also improve the
doc to reflect the new feature.

Change-Id: Ibf57b2021a504da950a491d63139a438087aed0b
Implements: blueprint cmd-with-multi-servers

Author: tang-chen

doc/source/command-objects/server.rst

@@ -643,17 +643,17 @@ Suspend server
 server unlock
 -------------
 
-Unlock server
+Unlock server(s)
 
 .. program:: server unlock
 .. code:: bash
 
     os server unlock
-        <server>
+        <server> [<server> ...]
 
 .. describe:: <server>
 
-    Server (name or ID)
+    Server(s) to unlock (name or ID)
 
 server unpause
 --------------

doc/source/commands.rst

@@ -186,7 +186,7 @@ Those actions with an opposite action are noted in parens if applicable.
 * ``start`` (``stop``) - start one or more servers
 * ``stop`` (``start``) - stop one or more servers
 * ``suspend`` (``resume``) - stop a server and save to disk freeing memory
-* ``unlock`` (``lock``) - unlock a server
+* ``unlock`` (``lock``) - unlock one or more servers
 * ``unpause`` (``pause``) - return one or more paused servers to running state
 * ``unrescue`` (``rescue``) - return a server to normal boot mode
 * ``unset`` (``set``) - remove an attribute of the object

openstackclient/compute/v2/server.py

@@ -1561,7 +1561,7 @@ def take_action(self, parsed_args):
 
 
 class UnlockServer(command.Command):
-    """Unlock server"""
+    """Unlock server(s)"""
 
     log = logging.getLogger(__name__ + '.UnlockServer')
 
@@ -1570,18 +1570,20 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'server',
             metavar='<server>',
-            help=_('Server (name or ID)'),
+            nargs='+',
+            help=_('Server(s) to unlock (name or ID)'),
         )
         return parser
 
     @utils.log_method(log)
     def take_action(self, parsed_args):
 
         compute_client = self.app.client_manager.compute
-        utils.find_resource(
-            compute_client.servers,
-            parsed_args.server,
-        ).unlock()
+        for server in parsed_args.server:
+            utils.find_resource(
+                compute_client.servers,
+                server,
+            ).unlock()
 
 
 class UnpauseServer(command.Command):