Remove versions.rb facts - this caused every node to print out dpkg-query warnings

Since custom facts are evaluated on every node, dpkg-query --show was running on
every node even if CDH was not installed.  Not good!  Facter 2+ has support
for confining facts to certain nodes based on arbitrary ruby code blocks.
If/when WMF starts using Facter 2+, we may bring this back.

For now, CDH versions will have to be hardcoded (e.g. hive auxpath).

Change-Id: I428dd458a6ba88415cab6d2041b7a733c0fe514f