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
