Move the rc framework out of sbin/init into libexec/rc.

The reasons for this are forward looking to pkgbase:
 * /sbin/init is a special binary; try not to replace it with
   every package update because an rc script was touched.
   (a follow-up commit will make init its own package)
 * having rc in its own place will allow more easy replacement
   of the rc framework with alternatives, such as openrc.

Discussed with:		brd (during BSDCam), kmoore
Requested by:		cem, bz
PR:			231522
Approved by:		re (gjb)

libexec/Makefile

@@ -13,6 +13,7 @@ SUBDIR=	${_atf} \
 	${_makewhatis.local} \
 	${_mknetid} \
 	${_pppoed} \
+	rc \
 	revnetgroup \
 	${_rlogind} \
 	rpc.rquotad \

libexec/rc/Makefile

@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+CONFGROUPS=	CONFETC CONFETCEXEC CONFETCDEFAULTS
+CONFETCDIR=	/etc
+CONFETC=	network.subr rc rc.initdiskless rc.subr rc.shutdown
+CONFETCMODE=	644
+CONFETCEXEC=	netstart pccard_ether rc.resume rc.suspend
+CONFETCEXECDIR=	/etc
+CONFETCEXECMODE=	755
+CONFETCDEFAULTSDIR=	/etc/defaults
+CONFETCDEFAULTS=	rc.conf
+PACKAGE=rc
+
+SUBDIR+=	rc.d
+
+.include <bsd.prog.mk>

libexec/rc/rc.d/Makefile

@@ -4,6 +4,7 @@
 
 CONFDIR=	/etc/rc.d
 CONFGROUPS=	CONFS
+PACKAGE=rc
 
 CONFS=	DAEMON \
 	FILESYSTEMS \