Parse and store rules version in DB.
Add versioning of rules files.
Import specific rules file, not any.
Export both new and old rules.

We need to continue to include rules/default-rules.js for older
candlepin servers to be able to import the newer manifests.

Because Candlepin was set up to assume there was a single file in rules/
sub-dir and just import it, we have to move the new rules elsewhere as
there is no guarantee which order the files will return in listFiles().
Fix to export the correct old rules file.