Description
===========

X Protocol gains ability to compress data, still only on X Protocol frame level
This functionality allows middle-ware to track X Protocol flow
without wasting CPU time on decompression, additionally server may choose not
to compress important messages like global-notices or errors.

Client application may configure following compression algorithms:

* zlib (DEFLATE_STREAM)
* lz4-frame (LZ4_MESSAGE)

Depending on protocol tracking needs, following compression options
may be configured:

* server_max_combine_messages - defines maximum number of X Protocol frames
  that may be placed into single compressed frame.
* server_combine_mixed_messages - defines if single compressed frame may
  include X Protocol frames of different type.

Administrator may disabled compression algorithms.

RB: 22235
Reviewed by: Grzegorz Szwarc <grzegorz.szwarc@oracle.com>
Reviewed by: Tomasz Stepniak <tomasz.s.stepniak@oracle.com>
Approved by Shiva Shankar <shiva.y.shankar@oracle.com>