Modify test_get_effective_quota test

The test_get_effective_quotas test uses key-manager:service-admin
legacy role to get the effective quotas. Using a user with only this
role should lead to an ERROR in an SRBAC environment.

This patch changes the test so that it checks whether the ERROR
occurred when the test tried to get quotas in SRBAC environment.

Also, auth.tempest_roles = member was removed from tempest.conf
as it is not necessary and causes a failure of the modified
test and it might cause unwanted problems in the future.

Change-Id: Ib106f5e760d3a5253968e2fe13ec576107a98c74
2 files changed