DevStack: PowerDNS and Bind9 should listen on SERVICE_HOST

Change-Id: I7eec6ddf9f7dd4ee17d0f50938b6fefdbfcc3dae
(cherry picked from commit 732b9cc9ae5792bdb154d318665d106152469d29)
Merge "DevStack: PowerDNS and Bind9 should listen on SERVICE_HOST"