replace wildcard cert for contacts.wikimedia.org

replacing the star.wikimedia.org certificate with a self signed
certificate for contacts.wikimedia.org.  As this is a legacy service
used by a single employee and doesn't have long term support, it seems
pointless to purchase a certificate for it.

Change-Id: Ifbd9342c8b0fc6b3e4c624b8499a75ec00b04d4b
RT: 6578
Merge "replace wildcard cert for contacts.wikimedia.org" into production