GRUB does not work when sb_meta_uuid is set on XFSv5

[Marcos Mello]

Background:

Kernel 4.3
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce748eaa65f2e9392ba82726503c8d994ffd6393

xfsprogs 4.2.0
http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfsprogs.git;a=commit;h=9c4e12fb60c15dc9c5e54041c9679454b42cb23e

I am using Xubuntu 16.04, which has 2.02-beta2 plus XFSv5 patches (1570140,
a139188, d3ffeb9, b6e80c7, ff3c200, 049dcfa) backported.

grub-install verbose output before "xfs_admin -U generate <dev>":

https://paste.fedoraproject.org/388290/

And after:

https://paste.fedoraproject.org/388291/

("-U restore" undoes the change)