If external connectivity fails, it is important that internal
services can still access an HAProxy instance. The current
defaults can cause a situation where all keepalived instances
enter the fault state despite internal connectivity being
available.
This patch splits the ping checks to allow deployments to define
a separate ping check for internal and external connectivity to
ensure that when one instance fails the other VIP remains in
operation.
Change-Id: Ideb34c43d1b1a30499cc88f28406cfa0368713ea