zfs: import zpool and zfs command-line utilities

bsd/cddl/contrib/opensolaris/cmd/zdb/zdb.8

bsd/cddl/contrib/opensolaris/cmd/zdb/zdb.c

bsd/cddl/contrib/opensolaris/cmd/zdb/zdb_il.c

bsd/cddl/contrib/opensolaris/cmd/zfs/zfs.8

bsd/cddl/contrib/opensolaris/cmd/zfs/zfs_iter.c

bsd/cddl/contrib/opensolaris/cmd/zfs/zfs_iter.h

bsd/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c

bsd/cddl/contrib/opensolaris/cmd/zfs/zfs_util.h

bsd/cddl/contrib/opensolaris/cmd/zhack/zhack.c

bsd/cddl/contrib/opensolaris/cmd/zinject/translate.c

bsd/cddl/contrib/opensolaris/cmd/zinject/zinject.c

bsd/cddl/contrib/opensolaris/cmd/zinject/zinject.h

bsd/cddl/contrib/opensolaris/cmd/zlook/zlook.c

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool.8

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool_iter.c

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool_util.c

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool_util.h

bsd/cddl/contrib/opensolaris/cmd/zpool/zpool_vdev.c