Fixes: HAProxy 1.5 config changes

HAProxy 1.5 configuration syntax has changed from the previous version.
Moving the configuration to something that HAProxy 1.5 understands

Merge issues -
Fixing the backend port for keystone-admin
Fixing the probe checks for glance backend

Change-Id: I46ee81a78b6286d1a18410fe8594e12b00093f7e
Closes-Bug: 1374204