Fixes for HA proxy start issue

This commit resolves -
* Issue where Apache is not listening on right
  bind address
* Issue where nova novpc should bind to a physical
  address instead of vip.

Fixes bug#1307536 & bug#1307537

Change-Id: I6f64e99ec7b62cff99bfec9666ca91655580a35c
Fix typo in horizon bind address

fix the class parameter typo in true.yaml
bind address for horizon.

Change-Id: Icce56e43e6742b90851c148bc723a1b7005f7a54