[TIMOB-17891] Added error message when using invalid TLS

[ashcoding]

Jira: https://jira.appcelerator.org/browse/TIMOB-17891
Sample code.

 var url = "https://www.google.com";
 var client = Ti.Network.createHTTPClient({
     // function called when the response data is available
     onload : function(e) {
         Ti.API.info("Received text: " + this.responseText);
         alert('success');
     },
     // function called when an error occurs, including a timeout
     onerror : function(e) {
         Ti.API.debug(e.error);
         alert('error');
     },
     //tlsVersion : Ti.Network.TLS_VERSION_1_1,
     timeout : 5000  // in milliseconds
 });
//tlsVersion can be set here or above
 client.setTlsVersion(400);
 alert('tls :'+client.getTlsVersion());
 // Prepare the connection.
 client.open("GET", url);
 // Send the request.
 client.send();

[hieupham007]

Code reviewed and functionally tested. Request accepted