more heat-cfntools dependency creep

[Matthew Miller]

heat-cfntools pulls ruby into the cloud image :(

We're _really_ trying to get interpretted languages _out_ of there, and
of course we're trying to get the size down overall. 

https://bugzilla.redhat.com/show_bug.cgi?id=1173682


I'm not sure when this started -- I wish I'd caught it before the f21
release.

We should have a nightly test check of some sort which alerts when
new packages are pulled in via dependency to the nightly image builds.


-- 
Matthew Miller
<mattdm at fedoraproject.org>
Fedora Project Leader