Add a new init script - network

This simply assigns static addresses and an optional default route.
It's possible to add external commands as well, so to create a bonded interface.

Hopefully we can add a few examples to satisfy most of the old net.lo, which
is no longer installed into boot by default.

init.d/Makefile

@@ -1,6 +1,6 @@
 DIR=	${INITDIR}
-SRCS=	bootmisc.in fsck.in hostname.in local.in localmount.in \
-	netmount.in root.in savecache.in swap.in sysctl.in urandom.in
+SRCS=	bootmisc.in fsck.in hostname.in local.in localmount.in netmount.in \
+	network.in root.in savecache.in swap.in sysctl.in urandom.in
 BIN=	${OBJS}
 
 INSTALLAFTER=	_installafter