LU-4065 mdt: missing NL in CERROR format

LU-4065 mdt: missing NL in CERROR format

Add a missing 'n' at the end of the CERROR format parameter to
avoid annoying "format at mdt_coordinator.c:977:mdt_hsm_cdt_start
doesn't end in newline" msg in syslog and the consequence of 2
merged lines/traces in Lustre debug-log.

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: Ic8baf81886b5be3de32ee595be99e20428729f6d
Reviewed-on: http://review.whamcloud.com/9597
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>