Bind nrpe to a primary address

It is undesirable that NRPE listens on multiple addresses a machine may
have since these may be service IP addresses and should not accept
connection there. Our monitoring systems should certainly never try to
connect using NRPE to a service IP address.
This change is intented to fill the gap while ferm is being rolled out
and the gap where ferm (iptables really) is not an option due to
performance issues.

Change-Id: Iac69e572e0a851dc1246d06e5a40f90a8a7373ed
Merge "Bind nrpe to a primary address" into production