Added some optimization to Passenger, the Rails application server.

Change-Id: I1168c4433761dd0d77634577a493cfca1c27f85c
Reviewed-on: https://review.openstack.org/23127
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Elizabeth Krumbach <lyz@princessleia.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins