modified:   common/util.h
	modified:   plnode/ds/cache.h
	modified:   plnode/ds/lookup_table_iterator.h
	modified:   plnode/protocol/plexus/plexus_message_processor.h
	modified:   plnode/protocol/plexus/plexus_protocol.h
	modified:   server_system_test.cc
	new file:   plnode/ds/cache_iterator.h