fix(client): remove path argument for config:push

We have specified a path option, so we can't
also have a path argument.

Author: Oliver Nordbjerg

client/deis.py

@@ -1325,7 +1325,7 @@ def config_push(self, args):
         The environment is read from <path>. This file can be read by foreman
         to load the local environment for your app.
 
-        Usage: deis config:push [<path>] [options]
+        Usage: deis config:push [options]
 
         Options:
           -a --app=<app>