r12866: This removes the abstraction layer in winbindd intended to deal with

r12866: This removes the abstraction layer in winbindd intended to deal with
multiple protocols, replacing it with the packet handling subsystem.

We don't have multiple protocols at present, and the abstraction layer
only serves to confuse matters.  Also, the new packet subsystem removes
the need to handle partial reads.

We can easily add new protocols from the socket up instead, becaue the
difficult bits are done by the packet layer.

Andrew Bartlett
(This used to be commit acf9dc8fe9e66f1dd3f18c0245375f502f03a24c)