Autofocus on the login screen now is on the first field. It's either
"User Name" or "Domain" with multidomain support. However it appears
to be more convenient to keep the focus on "User Name" whether there
is multidomain support or not. Also "Domain" is pre-filled with the
last domain used, so often there's no need to change it.
This patch moves "Domain" field under "User Name" and "Password" and
keeps autofocus always on "User Name".
Closes-Bug: #1916958
Change-Id: I590ce3a5cbaa0ebb470228a7114a60ff89467835
b09e5b303c