Implement Client configuration

- add mobile date network devices and configuration
- add client configuration via udev
- add GUI under networking tab
- add scripts to handle mobile data devices

config/client_config/ppp0_route.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# get gateway and ip address of UTMS modem connected to ppp0
+# add a default route 
+# called by /etc/network/interfaces.d/ppp0, when device is coming up
+#
+ppp0rt=""
+let i=1
+while [ -z "$ppp0rt" ] ; do
+  let i+=1
+  if [ $i -gt 20 ]; then
+    exit 1
+  fi
+  sleep 1
+  ppp0rt=`ip route list | grep -m 1 ppp0`
+done
+gate=`echo $ppp0rt |  sed -rn 's/(([0-9]{1,3}\.){3}[0-9]{1,3}).*ppp0.*src (([0-9]{1,3}\.){3}[0-9]{1,3})/\1/p'`
+src=`echo $ppp0rt |  sed -rn 's/(([0-9]{1,3}\.){3}[0-9]{1,3}).*ppp0.*src (([0-9]{1,3}\.){3}[0-9]{1,3})/\3/p'`
+
+ip route add default via $gate proto dhcp src $src metric 10
+exit 0