TT#76111 - Introduce 'is_system' column for admins schema

* The 'is_system' column will be used for users
	   that will have permission to see, create,
	   edit, delete lawful intercept admins

Change-Id: Ic7fd79717426013ffc9643764ea44f4de7adc7f9

lib/NGCP/Schema/Result/admins.pm

@@ -67,6 +67,8 @@ __PACKAGE__->add_columns(
   { data_type => "varchar", is_nullable => 1, size => 255 },
   "can_reset_password",
   { data_type => "tinyint", default_value => 1, is_nullable => 0 },
+  "is_system",
+  { data_type => "tinyint", default_value => 0, is_nullable => 0 },
 );
 
 __PACKAGE__->set_primary_key("id");