Currently CloudStack is using logging frameworks as log4j and Java util logging, logging wrappers as slf4j and Apache common logging.
Here changes are to made it uniform, using only log4j framework.
Removed Java util logging, slf4j and Apache common logging.
The managed context framework provides a simple way to add logic
to ACS at the various entry points of the system. As threads are
launched and ran listeners can be registered for onEntry or onLeave
of the managed context. This framework will be used specifically
to handle DB transaction checking and setting up the CallContext.
This framework is need to transition away from ACS custom AOP to
Spring AOP.
