net/keepalived: move track_interface generation into own section

In a vrrp_instance the track_interface could not be referenced similar
to a track_script. The uci track_interface section must be always set
into every vrrp_instance.

During config generation use the already prepared function
"print_track_elem_indent" to write the track_interface section into every
vrrp_instance which references this.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/keepalived/files/keepalived.init

@@ -297,8 +297,8 @@ vrrp_instance() {
 		printf "$INDENT_1}\n" >> $KEEPALIVED_CONF
 	done
 
-	# Handle track_interface & track_script lists
-	for opt in track_interface track_script; do
+	# Handle track_script lists
+	for opt in track_script; do
 		config_get $opt $1 $opt
 		eval optval=\$$opt
 		[ -z "$optval" ] && continue
@@ -309,6 +309,18 @@ vrrp_instance() {
 		printf "$INDENT_1}\n" >> $KEEPALIVED_CONF
 	done
 
+	# Handle track_interface lists
+	for opt in track_interface; do
+		config_get $opt $1 $opt
+		eval optval=\$$opt
+		[ -z "$optval" ] && continue
+		printf "$INDENT_1$opt {\n" >> $KEEPALIVED_CONF
+		for t in $optval; do
+			config_foreach print_track_elem_indent track_interface $t $INDENT_2
+		done
+		printf "$INDENT_1}\n" >> $KEEPALIVED_CONF
+	done
+
 	# Handle simple lists of strings (with no spaces in between)
 	for opt in unicast_peer; do
 		config_get $opt $1 $opt