Details:
  innodb-autoinc-optimize
     Add DROP TABLE which is missing (Backport of fix from 5.1)
  innodb_notembedded
     Take care that the disconnects of additional sessions
     are completed.

  Note:
     The merge 5.0 -> 5.1 for innodb-autoinc-optimize
     should be a "null" merge = no changes in 5.1.