Implemented the log level on common toolkit

Change-Id: I96dcb63aee3705d158350d153a15f5596cc6cef5
resolved some minot visibility bug on DataCache class and added
the class for channel caching managment. removed unused memcached code's
from DataCache.

Change-Id: Iec1acb342a71cd3d4439d666b440a4073aa5fd9d
correct the bug that prevent to compile using CMake

Change-Id: I3207cb5ee183903d6c415f4d31f81467afff2583