Add the initial environment uuid to the state servers collection in the envionment doc. Also add an upgrade step.
Some tests.
Remember the env UUID that the state database is initialized with.
Add tests for the upgrade step.
Merge pull request #570 from howbazaar/stateserver-doc-initial-uuid

Stateserver doc initial uuid

Store the uuid of the initial environment in the state server document collection.

The machine ids stored in that document only make sense when linked with an environment.  This seems like the sanest place to store the uuid of the initial environment.