Limit nova_floating_range to primary controller

Nova Floating ranges should be created on primary controller only.

Change-Id: If0ca2c57e4d412727382375df8347eb23442b001
Closes-Bug: 1334263
Signed-Off: Sergii Golovatiuk <sgolovatiuk@mirantis.com>
Merge "Limit nova_floating_range to primary controller"