Peridot: Project/tagging features

[NeilHanlon]

It should be possible to have tagging-like inheritance abilities in peridot. Meaning, it should be easy to assign a build to a project with ease or depend on other projects like inheritance. For example, it should be in theory possible to have a setup like so:

• Project A for version 10.0
• Project B for version 10.1
• 10.1 inherits 10.0. A compose of 10.1 should bring everything built in 10.0 with newer builds taking priority from 10.1

This would allow 10.1 to be mostly unaffected by 10.0 changes if the builds are older. It should also allow updates that are still occurring in 10.0 (before 10.1's release) to be available without shuffling builds between projects, as this assumes there isn't a new version built for 10.1. This is similar to koji tag inheritance.

It should be possible to clone a tag in its entirety and build on top of it also.