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

X Protocol gains ability to compress data, where only protobuf payload can be
compressed. This approach allows middle-ware software 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)
* lz4-frame (LZ4)

Depending on protocol tracking needs (tracking without decompression),
following compression styles can be configured:

* SINGLE - track individual X Protocol message (middle-ware knows how many:
           columns, rows, resultsets contains the server response)
* MULTIPLE - track X Protocol message of different kind (middle-ware knows
             that resultset has: non or at least one column, non or at least
             on row, number or resultsets)
* GROUP - track X Protocol message of different kind (middle-ware knows
             only that a responce is send back)

Administrator may disabled compression algorithms or styles.

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>