in clients --protocol should set the protocol used

at the moment in the client apps we have:

  -m [ --mysql ] Use MySQL Protocol.

Which is used to switch between the MySQL Protocol and the Drizzle Protocol (currently broken, I have a branch which fixes it for the drizzle client).

  --protocol arg The protocol of connection (tcp,socket,pipe,me
                                 mory).

Which does absolutely sod-all.

I propose removing the --mysql option and changing it to:

--protocol=mysql (default)
--protocol=drizzle
--protocol=...whatever...