LU-7296 ldlm: improve lock timeout messages

LU-7296 ldlm: improve lock timeout messages

In ldlm_expired_completion_wait() remove the useless LCONSOLE_WARN()
message and upgrade the LDLM_DEBUG() statement to LDLM_ERROR().

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I6293720bf8e038057a2c84a715359cdbb8cebe91
Reviewed-on: http://review.whamcloud.com/16824
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>