K 10
svn:author
V 9
allanjude
K 8
svn:date
V 27
2015-12-31T20:00:53.103457Z
K 7
svn:log
V 579
Introduce the ZFS Boot Environments menu to the loader menu

If the system was booted with ZFS, a new menu item (#7) appears
It contains an autogenerated list of ZFS Boot Environments

This allows the user to switch to an alternate root file system
Use Cases:
 - Revert a failed upgrade
 - Concurrently run different versions of FreeBSD with common home directory
 - Easier integration with the sysadmin/beadm utility

Requested by:	many
Reviewed by:	dteske
MFC after:	10 days
Relnotes:	yes
Sponsored by:	ScaleEngine Inc.
Differential Revision:	https://reviews.freebsd.org/D3167

END