added the performance channel and refactorying on message channel

CHAOSFramework.xcodeproj/project.pbxproj

CHAOSWorkspace.xcworkspace/contents.xcworkspacedata

CMakeLists.txt

ChaosDataService/DataConsumer.cpp

ChaosDataService/DataConsumer.h

ChaosDataService/cache_system/CacheDriver.cpp

ChaosDataService/cache_system/CacheDriver.h

ChaosDataService/cache_system/MemcachedCacheDriver.cpp

ChaosDataService/cache_system/MemcachedCacheDriver.h

ChaosDataService/cache_system/cache_system.h

ChaosDataService/dataservice_global.h

ChaosDataService/main.cpp

ChaosDataService/storage_system/VFSDriver.cpp

ChaosDataService/storage_system/VFSDriver.h

ChaosDataService/worker/AnswerDataWorker.cpp

chaos/common/CMakeLists.txt

chaos/common/chaos_constants.h

chaos/common/data/CDataWrapper.cpp

chaos/common/data/CDataWrapper.h

chaos/common/direct_io/DirectIOClientConnection.cpp