[fedora-arm] rootfs-resize v2

[Chris Tyler]

I've rewritten the rootfs-resize service and adjusted the package to
make it more robust and address these issues/RFEs:

* BZ 870501 - rootfs-resize causes loss of root filesystem

* RFE: Support GPT disklabels (untested, but should be handled by
libparted)

* BZ 870501 - update package to use new systemd macros

This version is in python and uses libparted via pyparted. It pulls in
one additional dependency that's not in current ARM composes
(python-psutil). The partition to be resized no longer has to be the
last partition on the device, as long as there is space to move the end
of the partition. 

Testing welcome. The script is available via github
(https://github.com/ctyler/rootfs-resize/) and the noarch package is in
f18 updates-testing and rawhide on PA (or you can grab it from
http://england.proximity.on.ca/chris/outbound/rootfs-resize-2.0/).

-Chris