Hack the client to support SphinxQL servers.

SphinxQL appears, to me, to be a bit of a piece of trash. The following
changes were made to support talking to a SphinxQL server:

 * Do not attempt to query max_allowed_packet. Assume the default
   instead.
 * Do not be pedantic when parsing out the number of columns. There will
   be unread bytes, just discard them.