As stated in Openstack logging and i18n guidelines it is
recommended that formatted string for log messages should be
generated by logger (not by logger client/user). In this case
we can skip formatted message generation if log level configured
not to show info messages.
Also some non-used initialization of logger has been deleted
from the code.
Change-Id: I25660395417ea288aee6a70609a5336e6f74c291