logger: skip resetting options if they match with current
logger: skip resetting options if they match with current

debug logs:

2018-12-04 17:07:46.177 16574 [DEBUG] tcmu_set_log_level:97: \
   No changes to current log_level: DEBUG, skipping it.
2018-12-04 17:07:46.177 16574 [DEBUG] tcmu_resetup_log_file:721: \
   No changes to current log_dir: /var/log, skipping it.

Signed-off-by: Prasanna Kumar Kalever <a78d8f98557446023f5b3ba9944d7be259a978a3@redhat.com>

open-iscsi/tcmu-runner,agrover/tcmu-runner,open-iscsi/tcmu-runner