remove swapfiles service

The swapfiles service was basically a copy of the swap service, so this
commit consolidates the functionality into the swap service.

X-Funtoo-Bug-URL: https://bugs.funtoo.org/browse/FL-2523
X-Gentoo-Bug: 568162
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=568162

runlevels/Makefile

@@ -1,7 +1,7 @@
 include ../mk/net.mk
 
 BOOT=		bootmisc fsck hostname localmount loopback \
-		root swap swapfiles sysctl urandom ${BOOT-${OS}}
+		root swap sysctl urandom ${BOOT-${OS}}
 DEFAULT=	local netmount
 NONETWORK=	local
 SHUTDOWN=	savecache ${SHUTDOWN-${OS}}