LU-6817 llite: lower message level for ll_setattr_raw()

LU-6817 llite: lower message level for ll_setattr_raw()

truncate and write can happen at the same time, so that a file can
be set modified even though the file is not restored from released
state, and ll_hsm_state_set() is not applicable for the file, and
it will return error in this case, we'd lower the error message level
in this case.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: Iff5bc0a6cec990e4e9f6f8f4ef0faacc229b828b
Reviewed-on: http://review.whamcloud.com/15541
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>