staging: lustre: mdc: quiet console message for known -EINTR

If a user process is waiting for MDS recovery during close, but the
process is interrupted, the file is still closed but it prints a
message on the console. Quiet the console message for -EINTR, since
this is expected behaviour.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6627
Reviewed-on: http://review.whamcloud.com/14911


Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>