Tmpfiles: create and delete entries once in the boot runlevel.

Initially, we were creating tmpfiles entries in the sysinit runlevel and
again in the boot runlevel. Systemd runs the --create and --remove
options in one service called systemd-tmpfiles-setup after the local
file systems are mounted. Now we have a service called tmpfiles.setup
which emulates this.

This also closes the bug mentioned below, since we were originally
writing to files that were on read-only file systems and that were not
available.

Reported-by: <devurandom@gmx.net>
X-Gentoo-Bug: 439012
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=439012

init.d/Makefile

@@ -1,8 +1,7 @@
 DIR=	${INITDIR}
 SRCS=	bootmisc.in fsck.in hostname.in local.in localmount.in netmount.in \
 	root.in savecache.in swap.in swapfiles.in \
-	tmpfilesd.boot.in tmpfilesd.sysinit.in \
-	swclock.in sysctl.in urandom.in ${SRCS-${OS}}
+	tmpfiles.setup.in swclock.in sysctl.in urandom.in ${SRCS-${OS}}
 BIN=	${OBJS}
 
 # Build our old net foo or not