Use quota_set instead of default_quota_set

In production cloud testing, tenant's quota_set may be
diffent with tenant's default_quota_set(i.e. we have changed
tenant's quota_set), so when testing creating servers with
overlimit vcpus or ram, we should get tenant's quota_set
instead of tenant's default_quota_set.

Change-Id: Id92436a3cf2ed8917ec35b985e20f8d25f5ef973
1 file changed