MFC r305195: MFV r302643:6902 speed up listing of snapshots if requesting name only and sorting by nameThis was our change from the beginning, so just reduce the upstream diff.
MFC r259850: MFV r258384:2583 Add -p (parsable) option to zfs listillumos/illumos-gate@43d68d68c1ce08fb35026bebfb141af422e7082e