MFC r353004, r353012:
r353004:
Explicitly add opensolaris_load="YES" to loader.conf through the
installer when installing the system on a ZFS root filesystem.

For arm64, zfs_load="YES" does not add opensolaris.ko as a kld
dependency, so add it explicitly to prevent boot-time failures
out-of-box.

r353012:
Add a comment explaining why the opensolaris_load line in loader.conf
is explicitly added.

PR: 240478
Approved by: re (kib, early MFC)
Sponsored by: Rubicon Communications, LLC (Netgate)

MFC r320138:

Fixed bsdinstall location of vfs.zfs.min_auto_ashift

Sponsored by: Multiplay

MFC r323448: bsdinstall: Ignore error return from newaliases(1)

This was originally added as "exit $SUCCESS" but with nothing to set the
SUCCESS variable. Thus it became an exit with no argument, which just
exits with the status of the preceding command.

Sponsored by: The FreeBSD Foundation

MFC r302897:

Add new System Hardening menu and options to bsdinstall.

This patch add new 'hardening' file responsible for new bsdinstall
'System Hardening' menu allowing users to set some sane and carefully
picked system security options (like random process id's, hiding
other users/groups processes and others).

All options are OFF by default in this patch due to POLA principle
with intention to turn change some of them to ON by default in future.

Reviewed by: adrian, allanjude, bdrewery, nwhitehorn
Approved by: re@, adrian, allanjude