Bug#820483: accommodate rename of btrfs-tools to btrfs-progs

[Nicholas D Steeves <nsteeves@gmail.com>]

Package: partman-btrfs
Version: 20

I am working on problems associated with bug #780081, where it was
planned to have a fix staged in experimental after Jessie was
released.

To access further information about this package, please visit the
following URL:

  http://mentors.debian.net/package/partman-btrfs

Alternatively, one can download the package with dget using this command:

  dget -x http://mentors.debian.net/debian/pool/main/p/partman-btrfs/partman-btrfs_20+nmu1.dsc

On #debian-boot jcristau said he prefered "a git tree [which] would be
easier than a source package tbh".  I don't have alioth permissions to
push to partman-btrfs or debian-cd so I've published it here.  Please
let me know if you'd prefer a diff.  The repo can be found here:

https://github.com/sten0/partman-btrfs.git

Thanks,
Nicholas