Various fixes (cleanups, valgrind, makefiles, ...)

server-tools/instance-manager/Makefile.am:
  increased default_monitoring interval
server-tools/instance-manager/guardian.cc:
  some fixes for proper shutdown
server-tools/instance-manager/guardian.h:
  removed init() prototype, as it was never used
server-tools/instance-manager/instance.cc:
  cleanup() function removed
server-tools/instance-manager/instance.h:
  cleanup() prototype removed
server-tools/instance-manager/instance_map.cc:
  Instance_map::cleanup() removed, as instances have nothing to clean up
server-tools/instance-manager/instance_map.h:
  Instance_map::cleanup() prototype removed
server-tools/instance-manager/instance_options.cc:
  added print_argv() function for debug purposes
server-tools/instance-manager/instance_options.h:
  declared print_argv()
server-tools/instance-manager/listener.cc:
  some fixed in listener for proper shutdown
server-tools/instance-manager/log.cc:
  cleanup
server-tools/instance-manager/log.h:
  cleanup
server-tools/instance-manager/manager.cc:
  some comments added
server-tools/instance-manager/mysqlmanager.cc:
  we need to free memory in the very end
server-tools/instance-manager/options.cc:
  fixed default options handling (as they were not working properly), added new method to cleanup Options
server-tools/instance-manager/options.h:
  cleanup() declared
server-tools/instance-manager/thread_registry.cc:
  cleanup
server-tools/instance-manager/user_map.cc:
  missing password file is not a critical error anymore, as IM should be able to work as mysqld_safe only

server-tools/instance-manager/instance_options.h

@@ -50,6 +50,7 @@ public:
   pid_t get_pid();
   void get_pid_filename(char *result);
   int unlink_pidfile();
+  void print_argv();
 
 public:
   /*