GitLab

Bug 1911817: User and group access roles for Edit access drop-down is populated by more than one source

 - change the way user and group roles are populated using
   the same methods in from the pieform

Change-Id: If9792e783a4ec1571145941d8161ad6e2b4655ae
Signed-off-by: Lisa Seeto <lisaseeto@catalyst.net.nz>