zfs send -p send properties only for snapshots that are actually sent

... as opposed to sending properties of all snapshots of the relevant
filesystem. The previous behavior results in properties being set on
all snapshots on the receiving side, which is quite slow.

Behavior of zfs send -R is not changed.

References:

http://thread.gmane.org/gmane.comp.file-systems.openzfs.devel/346

Ported-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2729
Issue #2210