If bind-address is usable, return it directly If bind-address is not usable (unset, 0.0.0.0, or loopback), we will use the host's default interface.

ChooseHostInterface is a method used fetch an IP for a daemon.It uses data from /proc/net/route file.For a node with no internet connection ,it returns errorFor a multi n/w interface node it returns the IP of the interface with gateway on it.