server-tools/instance-manager/buffer.cc:
  fix typo
server-tools/instance-manager/commands.cc:
  get rid of compiler warnings
server-tools/instance-manager/guardian.cc:
  fix compiler warning
server-tools/instance-manager/instance.cc:
  fix warnings
server-tools/instance-manager/instance_map.cc:
  fix return value
server-tools/instance-manager/instance_map.h:
  fix problem, caused autobuild failure. Looks like a gcc problem - 
  "friend class <name>" doesn't work if specified before enclosed class
  <name> (this is not present in newer gcc versions)