[sosreport] remove jython logging handler workaround

The workaround in sosreport.py for log handlers persisting past
logging.shutdown() on Jython causes further problems with leaking
log handler messages in the non-build case (i.e. where we are
calling the Archive's finalize() method). Fix this by removing
the workaround since sos no longer targets the Jython runtime.

Fixes: #393.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>