Finish switching nginx to apache2 on paste.

Change-Id: I9bb04bfd3c228eff636316dc3b79098ca801cbaa
Reviewed-on: https://review.openstack.org/29012
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins