Repair Rubocop violations
Remove hardcoded image ID
Fix various bugs in the test harness:

* Swap needs to be at least 2GB or the %postinst script asplodes
* Oracle's RPMs aren't signed (wtf?) so we need to hack the yum.conf to turn that off.
DigitalOcean changed their image IDs again
Move 'swap' to integration test dependencies
Update metadata for release
Update changelog for release [ci skip]
Need to declare dep on swap here