Reduced parameters not used in _populate_user()

The method "_populate_user" in /keystone/token/providers/common.py have
two parameters (domain_id and project_id)not used. the two parameters
should be reduced

Change-Id: I30e750f756259bb14ca8626c416f1511a0dc2537
Closes-bug: #1262589
Merge "Reduced parameters not used in _populate_user()"