mwan3: use ip monitor route to detect routing changes

use only committed uci changes for updating routing table

use functions.sh functions rather than uci command line tool
to find interfaces for routing table.

consolidate rtmon_ipv4 and rtmon_ipv6 functions into a single function

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>

net/mwan3/files/etc/config/mwan3

@@ -1,7 +1,6 @@
 
 config globals 'globals'
 	option mmx_mask '0x3F00'
-	option rtmon_interval '5'
 
 config interface 'wan'
 	option enabled '1'

net/mwan3/files/etc/hotplug.d/iface/15-mwan3

@@ -17,6 +17,7 @@ config_load mwan3
 config_get_bool enabled globals 'enabled' '0'
 [ "${enabled}" -gt 0 ] || {
 	mwan3_unlock "$ACTION" "$INTERFACE"
+	mwan3_flush_conntrack "$INTERFACE" "$ACTION"
 	exit 0
 }
 

net/mwan3/files/etc/hotplug.d/iface/16-mwan3

@@ -1,27 +0,0 @@
-#!/bin/sh
-
-. /lib/functions.sh
-. /lib/functions/network.sh
-. /lib/mwan3/mwan3.sh
-
-mwan3_lock "$ACTION" "mwan3rtmon"
-
-config_load mwan3
-config_get_bool enabled globals 'enabled' '0'
-[ "${enabled}" -gt 0 ] || {
-	mwan3_unlock "$ACTION" "mwan3rtmon"
-	exit 0
-}
-
-if [ "$ACTION" = "ifup" ]; then
-	mwan3_rtmon
-fi
-
-config_get_bool enabled "$INTERFACE" 'enabled' '0'
-[ "${enabled}" -eq 0 ] || {
-	mwan3_flush_conntrack "$INTERFACE" "$ACTION"
-}
-
-mwan3_unlock "$ACTION" "mwan3rtmon"
-
-exit 0