Remove code from mysqlhotcopy which deals with the so-called "RAID"
feature of older MyISAM.


scripts/mysqlhotcopy.sh:
  Remove code which tried to handle the so-called "RAID" files.
  
  The "RAID" feature has been dropped from MySQL builds, and this
  code caused mysqlhotcopy to skip (silently) over databases with
  two-character names (e.g., "ab").