LU-7355 osd: supress useless warning about many credits

LU-7355 osd: supress useless warning about many credits

on tiny systems (like we used to debug Lustre) journals are
tiny as max.transaction too. it doesn't help to warn about
this. we've got another precise mechanism to catch credits
misuse so it should be OK to suppress these messages.

Change-Id: I9599ae856bedb0a08a8dac01821e2c9a72377cac
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: http://review.whamcloud.com/16985
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>