3035 LZ4 compression support in ZFS and GRUB
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Christopher Siden <csiden@delphix.com>

Conflicts:

	usr/src/common/zfs/zfeature_common.c
	usr/src/common/zfs/zfeature_common.h
	usr/src/common/zfs/zfs_prop.c
	usr/src/man/man5/zpool-features.5
	usr/src/uts/common/fs/zfs/zfs_ioctl.c