Allow separate control and vhost0 IPs in contrail-vrouter-agent.conf

Add possibility to separate the control path for XMPP communication
between vrouter and contrail controllers to go over a separate network
from tenant traffic.

Change-Id: If618adcf6a06c2da3089b62d7433adac2c431acd
Closes-bug: PROD-8436
3 files changed