Skip internal logging conf when external one was provided

Gerrit's internal error and gc logging configuration was overriding
log4j configuration provided by -Dlog4j.configuration parameter. Now
when such parameter is present Gerrit will not call internal log
configuration but will relay on external one.

Change-Id: I8c808d6d4eee93480bcda138ed305288f5baaa39
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
2 files changed