Support filtering amphora list by image ID

This adds a --image-id parameter to the amphora list
command so that one can filter based on image.

This can be useful when doing rotations and only
listing those running the old image.

Change-Id: I30fb59ecbe4411b4d4eec3085ba393b2e48c3c6a

octaviaclient/osc/v2/amphora.py

@@ -62,6 +62,12 @@ class ListAmphora(lister.Lister):
             help="Filter by amphora provisioning status."
         )
 
+        parser.add_argument(
+            '--image-id',
+            metavar='<image-id>',
+            help="Filter by image ID.",
+        )
+
         parser.add_argument(
             '--long',
             action='store_true',

octaviaclient/osc/v2/utils.py

@@ -578,6 +578,7 @@ def get_amphora_attrs(client_manager, parsed_args):
         'compute_id': ('compute_id', str),
         'role': ('role', str),
         'status': ('status', str),
+        'image_id': ('image_id', str),
     }
 
     return _map_attrs(vars(parsed_args), attr_map)