Remove LOG in misc.py
Remove LOG in misc.py

LOG is not used in misc.py, so this is to remove it.

Change-Id: I5c1e3b675d770bbeaeece676880c56d840646284

openstack/tempest,masayukig/tempest,cisco-openstack/tempest,masayukig/tempest,cisco-openstack/tempest,openstack/tempest