Enhance the validation of the quotas update

Need force to update quota in tempest test cases, the related commit is
https://review.openstack.org/#/c/25887/

Temporary disable the two new test cases in test_quota
(test_security_groups_rules_exceed_limit,
test_security_groups_exceed_limit)
Another related change in tempest is
https://review.openstack.org/#/c/27043/

Change-Id: Ic61a99534ace7c45f51c6b638f0fc0365586e803
Merge "Enhance the validation of the quotas update"