Support bulk deletion for delete commands in computev2

Support bulk deletion and error handling for "keypair delete"
and "service delete" commands in computev2.
Up to now, all the delete commands in computev2 support bulk
deletion.

Change-Id: I6d5c960e9716188e56615514d0921618a15a88ec
Partially-Implements: blueprint multi-argument-compute
Partial-Bug: #1592906

openstackclient/compute/v2/keypair.py

@@ -16,6 +16,7 @@
 """Keypair action implementations"""
 
 import io
+import logging
 import os
 import sys
 
@@ -27,6 +28,9 @@ import six
 from openstackclient.i18n import _
 
 
+LOG = logging.getLogger(__name__)
+
+
 class CreateKeypair(command.ShowOne):
     """Create new public key"""
 
@@ -78,20 +82,37 @@ class CreateKeypair(command.ShowOne):
 
 
 class DeleteKeypair(command.Command):
-    """Delete public key"""
+    """Delete public key(s)"""
 
     def get_parser(self, prog_name):
         parser = super(DeleteKeypair, self).get_parser(prog_name)
         parser.add_argument(
             'name',
             metavar='<key>',
-            help=_("Public key to delete (name only)")
+            nargs='+',
+            help=_("Public key(s) to delete (name only)")
         )
         return parser
 
     def take_action(self, parsed_args):
         compute_client = self.app.client_manager.compute
-        compute_client.keypairs.delete(parsed_args.name)
+        result = 0
+        for n in parsed_args.name:
+            try:
+                data = utils.find_resource(
+                    compute_client.keypairs, n)
+                compute_client.keypairs.delete(data.name)
+            except Exception as e:
+                result += 1
+                LOG.error(_("Failed to delete public key with name "
+                          "'%(name)s': %(e)s")
+                          % {'name': n, 'e': e})
+
+        if result > 0:
+            total = len(parsed_args.name)
+            msg = (_("%(result)s of %(total)s public keys failed "
+                   "to delete.") % {'result': result, 'total': total})
+            raise exceptions.CommandError(msg)
 
 
 class ListKeypair(command.Lister):