network: if rd.neednet=0 we don't need a bootdev

otherwise dracut would wait for the bootdev interface to appear and be
setup

(cherry picked from commit f4f8fb5c10)

modules.d/40network/parse-ip-opts.sh

@@ -42,6 +42,8 @@ if [ -n "$NEEDBOOTDEV" ] && getargbool 1 rd.neednet; then
     #[ -z "$BOOTDEV" ] && warn "Please supply bootdev argument for multiple ip= lines"
     echo "rd.neednet=1" > /etc/cmdline.d/dracut-neednet.conf
     info "Multiple ip= arguments: assuming rd.neednet=1"
+else
+    unset NEEDBOOTDEV
 fi
 
 # Check ip= lines
@@ -50,17 +52,14 @@ for p in $(getargs ip=); do
     ip_to_var $p
 
     # make first device specified the BOOTDEV
-    if [ -z "$BOOTDEV" ] && [ -n "$dev" ]; then
+    if [ -n "$NEEDBOOTDEV" ] && [ -z "$BOOTDEV" ] && [ -n "$dev" ]; then
         BOOTDEV="$dev"
-        [ -n "$NEEDBOOTDEV" ] && info "Setting bootdev to '$BOOTDEV'"
+        info "Setting bootdev to '$BOOTDEV'"
     fi
 
     # skip ibft since we did it above
     [ "$autoconf" = "ibft" ] && continue
 
-    # We need to have an ip= line for the specified bootdev
-    [ -n "$NEEDBOOTDEV" ] && [ "$dev" = "$BOOTDEV" ] && BOOTDEVOK=1
-
     # Empty autoconf defaults to 'dhcp'
     if [ -z "$autoconf" ] ; then
         warn "Empty autoconf values default to dhcp"