swh.manage: Use production service port in dev mode

Make it overridable

swh/manage.py

 #!/usr/bin/env python3
 
+# Copyright (C) 2017  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
 import os
 import sys
 
+from swh.core import config
+
+
+DEFAULT_CONFIG = {
+    'port': ('int', 5006),
+    'host': ('str', '127.0.0.1'),
+}
+
+
 if __name__ == "__main__":
+    # override the default host:port
+    if sys.argv[1] == 'runserver':
+        conf = config.load_named_config('deposit/server',
+                                        default_conf=DEFAULT_CONFIG)
+        extra_cmd = ['%s:%s' % (conf['host'], conf['port'])]
+        cmd = sys.argv + extra_cmd
+    else:
+        cmd = sys.argv
+
     os.environ.setdefault("DJANGO_SETTINGS_MODULE",
                           "swh.deposit.settings.development")
     try:
@@ -21,4 +44,4 @@ if __name__ == "__main__":
                 "forget to activate a virtual environment?"
             )
         raise
-    execute_from_command_line(sys.argv)
+    execute_from_command_line(cmd)