Connect with a BusAttachment even if the connectSpec is not specified

If NULL is passed into alljoyn_busattachment_connect as the connectSpec
the parameterless version of BusAttachment.Connect will be used.

Some minor modifications to the AuthListenerTest most of the tests were a
modified version of the async version of the test.  Fixed a few copy paste
comments and names that referred to async tests.

Change-Id: Ib6866c7abe221554fb63ee08d367ead8920860cd