email: fill from autodiscover data when available

If the autodiscover was successful, then use that data to fill and validate the
Exchange account.

Change-Id: Ib265f315cf4032028f645d835aa1232074e40e96
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge "email: fill from autodiscover data when available" into du44