mysql-test/Makefile.am:
  Make installation procedure aware of the Instance Manager tests.
mysql-test/lib/mtr_cases.pl:
  Make collect_one_test_case() aware of the Instance Manager tests.
mysql-test/lib/mtr_process.pl:
  Minor changes:
    - open log files for append, not for overwrite. Append mode is very
      useful for debugging of several tests;
    - extract the code for killing processes into a separate function:
      mtr_kill_processes(). The function is used to stop IM-related processes.
mysql-test/mysql-test-run.pl:
  Added support for the Instance Manager tests.