- Never allocate floating IP for etcd service.
- Introduce a new label `master_lb_floating_ip_enabled` which controls
if Magnum allocates floating IP for the master load balancer. This
label only takes effect when the `master_lb_enabled` is set. The
default value is the same with `floating_ip_enabled`.
- The `floating_ip_enabled` property now only controls if Magnum
should allocate the floating IPs for the master and worker nodes.
Change-Id: I0a232406deaf112b0cb9e445735d7b49206c676d
Story: #2005153
Task: #29868
Lingxian Kong