Load-Blancer tabs should only be enabled when load-balancer endpoint is registered.
When you enable Octavia only on one region and switch to another region which don't have,
It will show you some infinite Error popup : "Error: Unable to retrieve load balancers."
Story 2008853
Task 42372
Change-Id: I1c69f34d70604db0de1e78e8c32716f8744b9e93