Use postMessage to alert window.topon framed login

[plessbd]

Replaces #1198

detect if login is within an iframe and do not redirect to the portal, instead send a postMessage to window.top

Use the following in window.top to recieve message and react accordingly

window.addEventListener("message", receiveMessage, false);

function receiveMessage(event) {
  if (event.origin !== "{FQDN OF XDMOD INSTANCE WITH PROTOCOL AND PORT IF NEEDED}"){
    console.log('Received message from untrusted origin, discarding');
    return;
  }
  if(event.data.application == 'xdmod'){
    if(event.data.message == 'loginComplete'){
      console.log('XDMoD has logged in successfully');
    }
	if(event.data.message == 'error'){
      console.log('ERROR: ' + event.data.info);
    }
  }
}