Do not add heat_stack_user role to admin (#2116)
Do not add heat_stack_user role to admin (#2116)

A user with heat_stack_user role will not be allowed to build heat
stacks. This role shouldn't be added to any real users, it just gets
added when heat adds users.

Change-Id: Icd37784d1bfe8a36a099df151292d95050ac4fc9
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