lxc-fedora-template: autodev, hostname, ARM archs, Raspberry Pi fixes

This took a lot longer for me to get around to it...  Sorry.

Patch to the lxc-fedora template.

I didn't get any further comments from my earlier proposal, weeks ago,
and did get one addition based on comments about properly setting the
hostname in /etc/hostname, which I've added.  I could have broken them
into separate patches but most are pretty small and minor.

Changes:

* Map armv6l and armv7l architectures to "arm" for yum and repos to
function properly.

* Detect Fedora Remix distros with no "/etc/fedora-release" file
(Raspberry Pi) and find proper release versions when "remix" part of the
file context.

* Change default Fedora container on non-Fedora hosts to Fedora 17.

* Added code for autodev for Fedora systemd containers.

* Added code to set /etc/hostname for Fedora > 14 (systemd).

* Fix a few typos.

Regards,
Mike
--
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw@WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
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--

Signed-off-by: Michael H. Warfield <mhw@WittsEnd.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>