Engine Crashing if Auth Hook isn't running

[TristenHarr]

When using the webhook auth if the Webhook Auth server isn't running, then engine crashes.

This could cause a serious problem if the Auth server goes down because it causes engine to crash.

When the auth server isn't running, and you go to the console and it tries to perform introspection it will crash the engine, with an exit code 132.

engine-1 exited with code 132

Rather than crashing and exiting, it would be better to provide the user with a useful message informing them that the authentication failed.