Change horizon binding address to local-ipv4 in haproxy case

By default horizon backend will listen on *:80
which is not valid setup in case we want haproxy to listen on vip

In case of using haproxy for ssl - service should listen on local-ipv4
In case stunnel for ssl - service should listen on 127.0.0.1 and stunnel
point to it

Change horizon priority to 14 in post-configure script is required
to run before apache2 is started

Change-Id: I233f9962a74f044f6497368d05ca9f22214f1def
Merge "Change horizon binding address to local-ipv4 in haproxy case"