Do not allow user to change domain of a project

Keystone Server already surfaces an error for this operation, but
we should restrict the user, and not offer --domain to be changed
for a project.

Change-Id: I48317e8accfea3c285e6ad213e75b783de8070ac
Closes-Bug: #1418384

doc/source/command-objects/project.rst

@@ -118,12 +118,6 @@ Set project properties
 
     Set project name
 
-.. option:: --domain <domain>
-
-    Set domain owning :ref:`\<project\> <project_set-project>` (name or ID)
-
-    .. versionadded:: 3
-
 .. option:: --description <description>
 
     Set project description

openstackclient/identity/v3/project.py

@@ -231,11 +231,6 @@ class SetProject(command.Command):
             metavar='<name>',
             help='Set project name',
         )
-        parser.add_argument(
-            '--domain',
-            metavar='<domain>',
-            help='Set domain owning <project> (name or ID)',
-        )
         parser.add_argument(
             '--description',
             metavar='<description>',
@@ -267,7 +262,6 @@ class SetProject(command.Command):
 
         if (not parsed_args.name
                 and not parsed_args.description
-                and not parsed_args.domain
                 and not parsed_args.enable
                 and not parsed_args.property
                 and not parsed_args.disable):
@@ -281,9 +275,6 @@ class SetProject(command.Command):
         kwargs = {}
         if parsed_args.name:
             kwargs['name'] = parsed_args.name
-        if parsed_args.domain:
-            kwargs['domain'] = common.find_domain(identity_client,
-                                                  parsed_args.domain).id
         if parsed_args.description:
             kwargs['description'] = parsed_args.description
         if parsed_args.enable: