Allow a certificate to be installed during deployment.  Useful for when the UAA is
using a self-signed certificate.

Ryan & Filip

[Finishes #60555016]
Add option http-server-close to HA Proxy configuration to ensure that the
X-Forwarded-Proto is set with each request.  Previously, this header was only set
on the first request.  See:

https://groups.google.com/a/cloudfoundry.org/forum/#!topic/vcap-dev/HHG9IxJDBNE