Fix help msg of identity endpoint

<service> argument of `endpoint create` command doesn't mean
`new endpoint service`, but an existent service that the new endpoint attached to.

Change-Id: I846fdb501bdea14499f42288186f375a3b2b5951

Author: sunyajing

doc/source/command-objects/endpoint.rst

@@ -40,7 +40,7 @@ Create new endpoint
 .. _endpoint_create-endpoint:
 .. describe:: <service>
 
-    New endpoint service (name or ID)
+    Service to be associated with new endpoint (name or ID)
 
 *Identity version 3 only*
 
@@ -68,7 +68,7 @@ Create new endpoint
 
 .. describe:: <service>
 
-    New endpoint service (name or ID)
+    Service to be associated with new endpoint(name or ID)
 
 .. describe:: <interface>
 
@@ -92,7 +92,7 @@ Delete endpoint
 .. _endpoint_delete-endpoint:
 .. describe:: <endpoint-id>
 
-    Endpoint ID to delete
+    Endpoint to delete (ID only)
 
 endpoint list
 -------------
@@ -110,7 +110,7 @@ List endpoints
 
 .. option:: --service <service>
 
-    Filter by service
+    Filter by service (name or ID)
 
     *Identity version 3 only*
 
@@ -177,7 +177,7 @@ Set endpoint properties
 .. _endpoint_set-endpoint:
 .. describe:: <endpoint-id>
 
-    Endpoint ID to modify
+    Endpoint to modify (ID only)
 
 endpoint show
 -------------

openstackclient/identity/v2_0/endpoint.py

@@ -31,7 +31,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'service',
             metavar='<service>',
-            help=_('New endpoint service (name or ID)'),
+            help=_('Service to be associated with new endpoint (name or ID)'),
         )
         parser.add_argument(
             '--publicurl',
@@ -81,7 +81,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'endpoint',
             metavar='<endpoint-id>',
-            help=_('Endpoint ID to delete'),
+            help=_('Endpoint to delete (ID only)'),
         )
         return parser
 

openstackclient/identity/v3/endpoint.py

@@ -39,7 +39,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'service',
             metavar='<service>',
-            help=_('New endpoint service (name or ID)'),
+            help=_('Service to be associated with new endpoint (name or ID)'),
         )
         parser.add_argument(
             'interface',
@@ -101,7 +101,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'endpoint',
             metavar='<endpoint-id>',
-            help=_('Endpoint ID to delete'),
+            help=_('Endpoint to delete (ID only)'),
         )
         return parser
 
@@ -120,7 +120,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--service',
             metavar='<service>',
-            help=_('Filter by service'),
+            help=_('Filter by service (name or ID)'),
         )
         parser.add_argument(
             '--interface',
@@ -168,7 +168,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'endpoint',
             metavar='<endpoint-id>',
-            help=_('Endpoint ID to modify'),
+            help=_('Endpoint to modify (ID only)'),
         )
         parser.add_argument(
             '--region',