safe shutdown and signal deliverence to all threads in 
the manager process


server-tools/instance-manager/Makefile.am:
  added listener.{h,cc} (listener thread)
  and thread_repository.{h,cc} - 
  class to handle threads && signals
server-tools/instance-manager/log.h:
  minor fixes
server-tools/instance-manager/manager.cc:
  unnecessary error checking was removed 
  added implementation for signal thread
server-tools/instance-manager/manager.h:
  header guards're added
server-tools/instance-manager/mysqlmanager.cc:
  unnecessary error checking was removed
server-tools/instance-manager/options.cc:
  minor fixes
server-tools/instance-manager/options.h:
  removed wrong declaration