restapi : the format of profile\user is not supported by REST-API

the format of domain\user is not supported by
restapi

Change-Id: I9c8907d4dc612d67bb881af5a579eb8f16ce238a
Bug-Url: https://bugzilla.redhat.com/1123545
Signed-off-by: Ravi Nori <rnori@redhat.com>