oportunity to check if any other process fails during this.
Add possiblitiy to store "user_data" in a Safeprocess
Add function to get pid from a SafeProcess


mysql-test/lib/My/SafeProcess.pm:
  Add possiblitiy to store "user_data" in a Safeprocess
  Add function to get pid from a SafeProcess
mysql-test/lib/mtr_report.pm:
  Print and detected test case sideffect also in the test server
mysql-test/mysql-test-run.pl:
  Run all check-warning and check-testcase in parallel, this also give the
  oportunity to check if any other process fails during this.