Bug if we try to use an auth_arg like --update, but no other args

[shreyb]

Ferry-CLI/ferry_cli/__main__.py

Line 582 in 06c7676

auth_args, other_args = get_auth_args()

In the lines starting with the one above, we have an order-of-operations bug. We currently do the following:

1. Get auth_args and other_args
2. If there's no other_args, print help and exit
3. See if --update is a part of auth_args, update swagger.json if it is
4. Generate endpoints and rest of stuff.

(2) and (3) are in the wrong order. The way it is now, running:

$ ferry-cli --update

fails because (2) will see that there are no other_args, and exit before we can check auth_args for the update key. We just need to switch those two steps.

[shreyb]

I slightly mispoke. Between (2) and (3) above, we also set up our authorization credential (a SciToken or X509 proxy). That needs to happen before the update check. So the steps should be:

1. Get auth_args and other_args
2. Set up credential from auth_args
3. See if --update is a part of auth_args, update swagger.json if it is
   a. If there's no other_args, exit 0 here, maybe with a nice message.
4. If no update flag, and if there's no other_args, print help and exit
5. Generate endpoints and rest of stuff.