LU-3449 tests: Trash track_declares_assert related errors

Do not care about track_declares_assert related errors (ie,
zfs, interop, ...).

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: Ie608ab0bd7fe3d02717931de1ba241638f5a124a
Reviewed-on: http://review.whamcloud.com/6639
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>