Use quotas/security_groups clients from tempest-lib

The files below have been migrated to tempest-lib

 * quotas_client.py         : I559c7ec29d6cc85060d59b8b7714a669a277f217
 * security_groups_client.py: I559c7ec29d6cc85060d59b8b7714a669a277f217

Now Tempest-lib provides those as stable interfaces. So Tempest should
start using those from lib and remove its own copy.

Change-Id: Ib97637566b5f48523b7b39899f0350fdf8f87a9e
5 files changed