If log level is already set via api or command line, initialization of io-stats xlator overwrites the log level to GF_LOG_INFO. This patch prevents re-initialization of log level if already set. Change-Id: I1f74d94ef8068b95ec696638c0a8b17d8d71aabe BUG: 1368882 Signed-off-by: Vijay Bellur <vbellur@redhat.com> Reported-by: Colin Lord <clord@redhat.com> Reviewed-on: http://review.gluster.org/15112 NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> Smoke: Gluster Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Niels de Vos <ndevos@redhat.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>