Refactor auto-deploy tracking in preparation for tracking stable releases and RCs
This refactors some of the release data tracking code, and code used for tagging auto-deployments. This work is needed to ensure CNG and Omnibus auto-deploys use the same timestamps, which in turn will allow us to record all release data in a single file. We also make some changes to the release tracking code so that it can ignore already tracked data, something that will make it easier to track release data for stable releases and RCs.
See the following for more information: