Remove heat_keystoneclient roles filtering workaround

The currently required version of keystoneclient contains the logic
to filter by name so remove the interim workaround

Change-Id: I7bd7657031e00d2db9376dbf587253a3b3be5a9d
Hide deprecate warnings for metadata tests

attribute metadata is deprecated, the deprecate
warnings in tests should be hidden

Change-Id: Ia7c04a8edb55fb5e2ef27a10da72804d4af75991
Remove unused generate_request_id

The heat.common.context module has an unused function to generate
the request id, this is now handled by the underlying oslo module
so can now be removed.

Change-Id: Iac5c2f8105dc88af5cae6937a68e1422694afe24
Merge "Hide deprecate warnings for metadata tests"
Merge "Remove unused generate_request_id"
Merge "Remove heat_keystoneclient roles filtering workaround"