MT#57447 Set reseller_id preference automatically when an account is created

This commit forces the creation of reseller_id preference
whenever a new subscriber is created in the same fashion of
the already existing preference account_id.

Change-Id: I8cc2b3b65e0e7a81e72452a3840fdd3540146968

lib/NGCP/Panel/Utils/Subscriber.pm

@@ -784,6 +784,7 @@ sub create_subscriber {
             tz => 'vienna',
         });
         $preferences->{account_id} = $contract->id;
+        $preferences->{reseller_id} = $contract->contact->reseller_id;
         $preferences->{ac} = $params->{e164}{ac}
             if(defined $params->{e164}{ac} && length($params->{e164}{ac}) > 0);
         $preferences->{cc} = $params->{e164}{cc}