[Libguestfs] [PATCH] Add tune2fs support to libguestfs.

At the moment OpenStack uses kpartx and nbd to resize filesystems and inject files to guests. I sincerely hope they don't allow untrusted users to upload guest images / AMIs :-( To fix this I'm looking into adding libguestfs support as an optional backend in OpenStack. The only missing feature in libguestfs is the ability to call tune2fs on a filesystem. This patch series adds tune2fs support. This also reveals a few bugs in the generator when you start to have calls with lots of required and optional parameters. Rich.