Fix pthread_mutex_trylock on HPUX (needed for query cache).


include/my_pthread.h:
  Fixed mutex problem with pthread_mutex_trylock on HPUX.
mysql-test/mysql-test-run.sh:
  Wait for .pid file instead of .sock, because .pid is created later.
mysql-test/r/query_cache.result:
  Test insert delated + query cache
mysql-test/t/query_cache.test:
  Test insert delated + query cache
mysys/my_pthread.c:
  Fixed mutex problem with pthread_mutex_trylock on HPUX.
sql/repl_failsafe.cc:
  Safety
sql/sql_insert.cc:
  Fix insert delated + query cache