Do not print "null" or "noop" when configuring an interface

Note by william hubbs:

I modified the patch to compare "null" and "noop" with $1 instead of
${config}.

Reported-by:    Yun Zheng Hu <hu@fox-it.com>
X-Gentoo-Bug: 379577
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=379577

init.d/net.lo.in

@@ -545,7 +545,9 @@ start()
 		[ -z "${config}" ] && break
 
 		set -- ${config}
-		ebegin "$1"
+		if [ "$1" != "null" -a "$1" != "noop" ]; then
+			ebegin "$1"
+		fi
 		eindent
 		case "$1" in
 			noop)