New behavior:
* There are two primary paths through this activity:
* Edit existing:
* Load existing values from account into fields
* When user clicks 'next':
* Confirm not a duplicate account
* Try new values (check settings)
* If new values are OK:
* Write new values (save to provider)
* finish() (pop to previous)
*
* Creating New:
* Try Auto-discover to get details from server
* If Auto-discover reports an authentication failure:
* finish() (pop to previous, to re-enter username & password)
* If Auto-discover succeeds:
* write server's account details into account
* Load values from account into fields
* Confirm not a duplicate account
* Try new values (check settings)
* If new values are OK:
* Write new values (save to provider)
* Proceed to options screen
* finish() (removes self from back stack)
* Added unit test for new loadFields method
Bug: 2412300
8bb0ee3b92