[arch-general] Better NILFS2 Support

[Alex Matviychuk]

I just spent some time setting up my new laptop with an SSD to use
NILFS2 as its root filesystem and I'm very pleased with the
performance.

In an effort to get better support for NILFS2 in arch I've added a
request to move nilfs-utils to the base group and submitted a patch to
initscripts to bring up the nlfs_cleanerd daemon if root is formatted
as NILFS2. If NILFS2 is used on other partitions the mount command
brings up the daemon on it's own.

These two bugs should make it easier to add NILFS2 support to the Arch
Installation Framework.

Related bugs here, patch comments welcome:

http://bugs.archlinux.org/task/20260
http://bugs.archlinux.org/task/20261

Cheers,
alexmat