Haproxy configuration

Added several sections that are required for HAproxy configuration

1. haproxy.services - standard openstack services ports
2. haproxy.nodes - openstack controllers
3. haproxy.net_binds - virtual ips, that will also act as public endpoint

input controller_nodes scales with OVERCLOUD_CONTROLSCALE > 1

Related change t-i-e I641fa90c4a34c26e5699cf7f5a6f9643792c7b16

Implements blueprint tripleo-haproxy-configuration
Related to blueprint tripleo-icehouse-ha-production-configuration

Change-Id: I9c70812ee1b3e8c8c072705fc5123da88ecc8f9f
Merge "Haproxy configuration"