Remove support for pkg.conf in light of the consolidation towards

a single configuration file for the OpenBSD repository location.
The pkg_* tools now use installurl(5) to find the package repository.
NOTE:
/etc/installurl only contains a single URL pointing to a mirror.
Use the PKG_PATH environment variable to specify more than one
package repository.
prodded by and OK deraadt@ aja@

src/etc/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.451 2017/02/26 16:51:18 matthieu Exp $
+#	$OpenBSD: Makefile,v 1.452 2017/02/27 21:53:11 rpe Exp $
 
 .include <bsd.own.mk>
 
@@ -40,7 +40,7 @@ MUTABLE=acme-client.conf changelist daily etc.${MACHINE}/disktab \
 # -rw-r--r--
 EXAMPLES=chio.conf dhclient.conf dhcpd.conf exports \
 	httpd.conf ifstated.conf inetd.conf man.conf mixerctl.conf \
-	mrouted.conf ntpd.conf pkg.conf printcap rbootd.conf \
+	mrouted.conf ntpd.conf printcap rbootd.conf \
 	remote sensorsd.conf wsconsctl.conf
 
 # -rw-------

src/etc/changelist

@@ -1,4 +1,4 @@
-#	$OpenBSD: changelist,v 1.115 2017/01/24 03:13:13 ajacoutot Exp $
+#	$OpenBSD: changelist,v 1.116 2017/02/27 21:53:11 rpe Exp $
 #
 # List of files which the security script backs up and checks
 # for modifications.
@@ -90,7 +90,6 @@
 /etc/passwd
 /etc/pf.conf
 /etc/pf.os
-/etc/pkg.conf
 /etc/printcap
 /etc/profile
 /etc/protocols

src/etc/examples/pkg.conf

@@ -1,146 +0,0 @@
-# $OpenBSD: pkg.conf,v 1.25 2017/02/23 12:48:08 sthen Exp $
-#
-# Mirrors update at differing schedules. If using snapshots, sticking
-# with one host will reduce risk of fetching out-of-sync packages.
-
-# Anycast CDN
-#installpath = mirrors.evowise.com
-
-# Australia
-#installpath = mirror.internode.on.net
-#installpath = mirror.aarnet.edu.au
-
-# Austria
-#installpath = http://ftp5.eu.openbsd.org/ftp/pub/OpenBSD/%c/packages/%a/
-#installpath = ftp2.eu.openbsd.org
-
-# Brazil
-#installpath = openbsd.c3sl.ufpr.br
-#installpath = mirrors.unb.br
-
-# Bulgaria
-#installpath = openbsd.ipacct.com
-
-# Canada
-#installpath = ftp.OpenBSD.org
-#installpath = openbsd.cs.toronto.edu
-#installpath = openbsd.delfic.org
-#installpath = openbsd.mirror.netelligent.ca
-
-# Costa Rica
-#installpath = http://mirrors.ucr.ac.cr/OpenBSD/%c/packages/%a/
-
-# Denmark
-#installpath = mirrors.dotsrc.org
-#installpath = mirror.one.com
-
-# Estonia
-#installpath = ftp.aso.ee
-
-# France
-#installpath = ftp.fr.openbsd.org
-#installpath = ftp2.fr.openbsd.org
-#installpath = mirrors.ircam.fr
-
-# Germany
-#installpath = ftp.spline.de
-#installpath = mirror.hs-esslingen.de
-#installpath = ftp.bytemine.net
-#installpath = http://ftp.halifax.rwth-aachen.de/openbsd/%c/packages/%a/
-#installpath = http://artfiles.org/openbsd/%c/packages/%a/
-#installpath = ftp.hostserver.de
-
-# Greece
-#installpath = ftp.cc.uoc.gr
-
-# Hong Kong
-#installpath = openbsd.hk
-
-# Hungary
-#installpath = ftp.fsn.hu
-
-# Indonesia
-#installpath = kartolo.sby.datautama.net.id
-
-# Ireland
-#installpath = ftp.heanet.ie
-
-# Italy
-#installpath = openbsd.mirror.garr.it
-
-# Japan
-#installpath = ftp.jaist.ac.jp
-#installpath = www.ftp.ne.jp
-
-# Lithuania
-#installpath = mirror.litnet.lt
-
-# The Netherlands
-#installpath = mirror.meerval.net
-#installpath = ftp.nluug.nl
-#installpath = ftp.bit.nl
-#installpath = mirrors.dalenys.com
-
-# Phillipines
-#installpath = mirror.rise.ph
-
-# Poland
-#installpath = piotrkosoft.net
-#installpath = ftp.icm.edu.pl
-
-# Romania
-#installpath = mirrors.pidginhost.com
-
-# Russia
-#installpath = mirror.yandex.ru
-
-# Slovenia
-#installpath = www.obsd.si
-
-# Sweden
-#installpath = ftp.eu.openbsd.org
-
-# Switzerland
-#installpath = http://mirror.switch.ch/ftp/pub/OpenBSD/%c/packages/%a/
-
-# Taiwan
-#installpath = ftp.yzu.edu.tw
-
-# Ukraine
-#installpath = mirror.eject.name
-
-# United Kingdom
-#installpath = www.mirrorservice.org
-#installpath = anorien.csc.warwick.ac.uk
-#installpath = mirror.bytemark.co.uk
-#installpath = mirror.ox.ac.uk
-#installpath = mirror.exonetric.net
-
-# CA, USA
-#installpath = mirrors.sonic.net
-
-# CO, USA
-#installpath = ftp3.usa.openbsd.org
-
-# ID, USA
-#installpath = mirrors.syringanetworks.net
-
-# IL, USA
-#installpath = mirrors.gigenet.com
-
-# MA, USA
-#installpath = mirrors.mit.edu
-
-# NY, USA
-#installpath = ftp4.usa.openbsd.org
-#installpath = ftp5.usa.openbsd.org
-
-# PA, USA
-#installpath = http://openbsd.mirrors.hoobly.com/%c/packages/%a/
-#installpath = http://openbsd.mirrors.pair.com/%c/packages/%a/
-
-# TX, USA
-#installpath = mirror.esc7.net
-
-# VA, USA
-#installpath = mirror.jmu.edu