Change default BIP to 172.31.254.1/24 for docker on mon's

Since we need to avoid any network overlappings, and we see
docker's default network 172.17.xx.xx overlaps now with
Devcloud's floating ips, we need to change default BIP to
smth else network.

Change-Id: Ia8e48b772e68a79a8cd2b47c51bd143bff669abf
Closes-Bug: PROD-23555
1 file changed