when `show xxxx` syntax not support, use information_schema for drop
  back.

COL.014 modify the judgment about the character set;COL.012/COL.015 add the judgment about the json type;ALT.001 modify the judgment about the ;fix func ShowCreateTable's error when table is partition;

  sleep(), benchmark(), get_lock, release_lock() are
  dangerous function may not be used in online.

  SHOW TABLE STATUS

  Rows
  AvgRowLength
  DataLENGTH
  MaxDataLength
  IndexLength
  DataFree

  1. remove Index_Comment in ShowIndex function
  2. remove mysql client deps in Makefile

not fix too many connections yet

  1. fix -config arg parse bug
  2. code & comment lint