decom pdf1,remove from site.pp,dsh,dhcpd

pdf1 is broken
hardware repair has been attempted in the past in #6611

#6149 is the related ticket about PDF server migration

at the time of this writing pdf1 is down,
but pdf2 and pdf3 are still up in Tampa.

remove pdf1 from everything, confirmed by RobH.

RT #6940

Change-Id: I7791282299dde971e41a6b2f4c350776f2f8b07f