plugins: Invoke setup_parser_common_args explicitly from setup_parser

This allows to define plugins which do not need have any of common args.

Move setup_parser_common_args into libkas for this as it now becomes a
library function.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas/kas.py

@@ -97,20 +97,6 @@ def _atexit_handler():
         loop.close()
 
 
-def setup_parser_common_args(parser):
-    parser.add_argument('config',
-                        help='Config file')
-    parser.add_argument('--skip',
-                        help='Skip build steps',
-                        default=[])
-    parser.add_argument('--force-checkout', action='store_true',
-                        help='Always checkout the desired refspec of each '
-                        'repository, discarding any local changes')
-    parser.add_argument('--update', action='store_true',
-                        help='Pull new upstream changes to the desired '
-                        'refspec even if it is already checked out locally')
-
-
 def kas_get_argparser():
     """
         Creates an argparser for kas with all plugins.
@@ -137,7 +123,6 @@ def kas_get_argparser():
 
     for plugin in plugins.all():
         plugin_parser = subparser.add_parser(plugin.name, help=plugin.helpmsg)
-        setup_parser_common_args(plugin_parser)
         plugin.setup_parser(plugin_parser)
 
     return parser