im_daemon_life_cycle fails randomly.

1. Move IM-angel functionality into a separate file, create Angel class.
2. Be more verbose;
3. Fix typo in FLUSH INSTANCES implementation;
4. Polishing.


mysql-test/r/im_options.result:
  Updated result file.
mysql-test/t/im_cmd_line.imtest:
  Updated test.
server-tools/instance-manager/IMService.cpp:
  Move HandleServiceOptions() into IMService::main().
server-tools/instance-manager/IMService.h:
  Move HandleServiceOptions() into IMService::main().
server-tools/instance-manager/Makefile.am:
  Added angel.cc and angel.h.
server-tools/instance-manager/WindowsService.cpp:
  Initialize class-members in constructor.
server-tools/instance-manager/WindowsService.h:
  Initialize class-members in constructor.
server-tools/instance-manager/commands.cc:
  Return actual error code (ER_OUT_OF_RESOURCES or ER_THERE_IS_ACTIVE_INSTANCE)
  from FLUSH INSTANCES.
server-tools/instance-manager/manager.cc:
  1. Return actual error code from Manager::flush_instances().
  2. Be more verbose.
server-tools/instance-manager/manager.h:
  Return actual error code from Manager::flush_instances().
server-tools/instance-manager/mysqlmanager.cc:
  Move IM-angel functionality into separate file (angel.cc).
server-tools/instance-manager/priv.cc:
  Use return bool datatype instead int{ 0, 1 }.
server-tools/instance-manager/priv.h:
  Use return bool datatype instead int{ 0, 1 }.
server-tools/instance-manager/angel.cc:
  IM-angel functionality.
server-tools/instance-manager/angel.h:
  IM-angel functionality.