LU-2696 utils: fix error message in rmtacl_notify()

LU-2696 utils: fix error message in rmtacl_notify()

Print mnt->mnt_dir instead of fd in error message, and print
the ioctl type that failed.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: Ia10c992e4f6ed1dbab86ccfea9d85ea2e0f81cf5
Reviewed-on: http://review.whamcloud.com/5187
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>