move logging to runtime init

move logging to runtime init

There are many ways to init logging, but
doing import-time logic can cause problems.

For yardstick we are doing this type of run-time
init in the main program startup.

This allows for some flexibiliy since we just
set the root loggers.  Every other logger is
standard, not subclassed

Change-Id: I7004a147f03a7104f373141caf9206d8e49a5d4c
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>