MFC r251646 + r252219:

MFC r251646 + r252219:

MFV r251644:

Poor ZFS send / receive performance due to snapshot
hold / release processing (by smh@)

Illumos ZFS issues:
3740 Poor ZFS send / receive performance due to snapshot
     hold / release processing

MFV r252215:

Restore a previous behavior before r251646, where when destructing
ZFS snapshot, the ioctl would return ENOENT when it hit any of
them in the errlist (the new behavior was only return ENOENT when
all returns error).

Illumos ZFS issues:
  3829 fix for 3740 changed behavior of zfs destroy/hold/release ioctl

git-svn-id: svn://svn.freebsd.org/base/stable/9@252764 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f