Support non-email address logins

[chibenwa]

Why?

As part of a customer project we need to support logins without domain part. This enables us to set up applicative passwords.

Today Twake sync requests a mail address:

We need to make Twake sync evolve to also support this use case.

Proposition

Display two fields:

• LOGIN
• Password

IF the login is a mail address -> proceed like today

IF the login is NOT a mail address then prompt the user for a server URL then proceed.