HAProxy: change to use option forwardfor to pass origin IP address
to backend via X-Forwarded-For header
Keystone: Apache does the audit logs for keystone. Change the
LogFormat to display the passed address instead of the connection
address which is that of the load balancer.
Nova, Cinder, Glance: these services can make use of the address
passed in X-Forwarded-For. With this setting the API logs for
these services include the client IP address.
Change-Id: Ia861ecc11a7c7d463d0366586926d1a842853f69
Closes-Bug: #1548935
b770339534