R1:237b1d769b00

Improve `bin/storage upgrade` behavior when run out-of-order

Summary:
Fixes T5770. This error occurs if you run `bin/storage upgrade` before you set up MySQL credentials.

This isn't what the setup guide says to do, but it's an easy mistake to make and should be a permitted install path since there's no reason you can't do things in this order.

Specifically, we use a mixture of "standard" (configured) and "administrative" (`--user` and `--password`) credentials, and if the standard ones are bogus bad…