Improve the SecurityErrorEvent message

[jbarber]

The error message when failing to connect to the security policy is not very useful:

An security error occurred (Error #2048). Check your policy-policy server configuration or disable security for this domain

We should change this to tell the user what they should do.

[jbarber]

The message is generated by a SecurityErrorEvent.SECURITY_ERROR event on the socket.

This is described here and here.

The policy is loaded with the code here. Checked with wireshark and it looks like the implementation agrees with the documentation for loadPolicy(). However, the signature for that function doesn't let us know if the policy was successfully loaded or not...

[jbarber]

#29 addresses this

[jbarber]

@kristen-allie FYI

[jbarber]

The message also appears when the VNC port isn't available. But only after the "An IO error occured [sic]" message. Ignore this for now.

[sweeneyapps]

@jbarber Can you check this out at the forum https://forum.rainforestqa.com/t/a-security-error-occurred-error-2048/1772/31
A tester is having problem w/ 2048 error code.

[jbarber]

@sweeneyapps my guess is that they don't have connectivity to the server, I'll chase it up in the formum thread