This fixes issue with consistency groups API which is always
returning 'context.project_id' specific consistency groups from
cinder.groups instead of required project specific groups i.e.
irrespective of filters ('all_tenants','project_id') being passed
it is returning context.project_id groups.
Closes-Bug: #1671220
Change-Id: I553aab33c01f1e5b0053172e86d276ccfabf4952
(cherry picked from commit 9ed8c61ec5)
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