* Allow AccountService loginFailed API to take a reason string
* Present the reason string in the dialog shown from the login
failure notification
* Handle ALERTs in IMAP login responses (for example, some servers
will occasionally require web login and we need to inform them,
rather than simply saying the password is wrong)
* This fixes a longstanding bug in our Imap1 implementation
Change-Id: I8b270cd5d4746559b6c8a78bce02f0e7c525bdea