Remove workaround for ZFS bug; fix was committed to the //depot/user/pjd/zfs/... branch some time ago.
Remove workaround for ZFS bug; fix was committed to the //depot/user/pjd/zfs/...
branch some time ago.

MFC after:	two weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase