Move get_context_from_function_and_args() to context.py
Move get_context_from_function_and_args() to context.py

Word on the street is that exception.py may soon be deprecated,
and context.py is a better place anyway.

(Also removed an import of utils.py because /it/ imports exception.py.)

Change-Id: I856fc6f4558cc01ddca350ee4cfd4684db47475b

varunarya10/oslo.log,JioCloud/oslo.log,akash1808/oslo.log,zzicewind/oslo.log,dims/oslo.log,openstack/oslo.log,magic0704/oslo.log,meganjbaker/oslo.log