Implement test for ServerLifecycleListener.performClientConnectionFailCallbacks #222
Description
#221 appeared to remove coverage of the ServerLifecycleListener.performClientConnectionFailCallbacks() function, but this was really because of an error handling fix I just submitted to BlueSSLService (Kitura/BlueSSLService#42).
We should have a test that deliberately fails to initialize a connection, and checks that the fail callback is called.