10173 loader: support newer ZFS versions

Review Request #1340 - Created Jan. 4, 2019 and submitted - Latest diff uploaded

Information
Toomas Soome
illumos-gate
10173
d184b69...
Reviewers
general
zfsboot: support newer ZFS versions
declare v3 objset size/layout to fix userboot and possibly other loader issues

- fix for userboot assertion failure in zfs_dev_close in free due to out of bounds write
- fix for zfs_alloc / zfs_free mismatch assertion failure when booting GPT on BIOS

https://svnweb.freebsd.org/changeset/base/342747

  
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