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[UNDERTOW-143] Test for SPNEGO authentication in issolation.

To be continued...
[UNDERTOW-37] Added initialisation of a KDC as a basis for all SPNEGO based testing.
[UNDERTOW-143] Add the message exchange for a standard SPNEGO authentication.
Properly log exception
Fix big to do with buffer flipping the the pipelining conduit
Use the is_ssl AJP attribute to set the request scheme
Request dispatch query parameters again
Introduce some utility classes for dealing with framed protocols, and port the web sockets implementation over to them

The most user visible change is that now the underlying web socket implementation deals with
continuations automatically. Messages with multiple frames are now automatically merged into a single
channel.