create image: fix --repo default ip value

rest.URL is the ip and port of the ogServer like: 192.168.56.10:8888,
specified in ogcli.json.

As long as the host and port is specified in rest.URL, split by the ':'
character and extract the ip.

Fixes OpenGnsys clients failing to execute the command due to invalid
repository IP being fed to the underlying bash scripts.

cli/objects/images.py

@@ -117,7 +117,7 @@ class OgImage():
 				    help='Image description (for new images)')
 		parser.add_argument('--repo',
 				    nargs='?',
-				    default=urlparse(rest.URL).netloc,
+				    default=urlparse(rest.URL).netloc.split(':')[0],
 				    help='Images repository ip')
 		group = parser.add_argument_group('clients', 'Client selection args')
 		group.add_argument('--client-ip',