MT#13919 Use checksum of field config.

This enables Innovaphone to determine config changes and only reset
if it actually changed.

Change-Id: Id99424b258946ac81412bad10d4f04ffe3330c5e

lib/NGCP/Panel/Controller/Device.pm

@@ -3,6 +3,8 @@ use Sipwise::Base;
 
 use Template;
 use Crypt::Rijndael;
+use Digest::MD5 qw/md5_hex/;
+use Storable qw/freeze/;
 use JSON qw(decode_json encode_json);
 use NGCP::Panel::Form::Device::Model;
 use NGCP::Panel::Form::Device::ModelAdmin;
@@ -1359,6 +1361,11 @@ sub dev_field_config :Chained('/') :PathPart('device/autoprov/config') :Args() {
     }
 
     my $data = $dev->profile->config->data;
+
+    my $var_hash = md5_hex(freeze $vars);
+    my $cfg_hash = md5_hex($data);
+    $vars->{checksum} = md5_hex($var_hash . $cfg_hash);
+
     my $processed_data = "";
     my $t = Template->new({
         PLUGIN_BASE => 'NGCP::Panel::Template::Plugin',