luci-app-mwan3: fix legacy uci api usage

Explicitely require libuci-lua in model classes that use legacy /var/state
cursor handling.

Also add a specific dependency on libuci-lua to the luci-app-mwan3
Makefile in preparation of the upcoming default removal of libuci-lua.

Finally fix the post data dispatching on the notification tab, see #1722
for reference.

Fixes #1726.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

applications/luci-app-mwan3/Makefile

@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 LUCI_TITLE:=LuCI support for the MWAN3 multiwan hotplug script
-LUCI_DEPENDS:=+mwan3 +luci-mod-admin-full +luci-app-firewall +luci-lib-nixio
+LUCI_DEPENDS:=+mwan3 +libuci-lua +luci-mod-admin-full +luci-app-firewall +luci-lib-nixio
 LUCI_PKGARCH:=all
 PKG_LICENSE:=GPLv2
 

applications/luci-app-mwan3/luasrc/controller/mwan3.lua

@@ -56,7 +56,7 @@ function index()
 		arcombine(cbi("mwan/rule"), cbi("mwan/ruleconfig")),
 		_("Rules"), 40).leaf = true
 	entry({"admin", "network", "mwan", "notify"},
-		cbi("mwan/notify"),
+		form("mwan/notify"),
 		_("Notification"), 50).leaf = true
 end
 

applications/luci-app-mwan3/luasrc/model/cbi/mwan/interface.lua

@@ -3,6 +3,7 @@
 -- Licensed to the public under the GNU General Public License v2.
 
 dsp = require "luci.dispatcher"
+uci = require "uci"
 
 
 function interfaceWarnings(overview, count, iface_max)

applications/luci-app-mwan3/luasrc/model/cbi/mwan/policy.lua

@@ -3,6 +3,7 @@
 -- Licensed to the public under the GNU General Public License v2.
 
 dsp = require "luci.dispatcher"
+uci = require "uci"
 
 
 function policyCheck()

applications/luci-app-mwan3/luasrc/model/cbi/mwan/rule.lua

@@ -3,6 +3,7 @@
 -- Licensed to the public under the GNU General Public License v2.
 
 dsp = require "luci.dispatcher"
+uci = require "uci"
 
 
 function ruleCheck()