State: add EnvUUID to statusDoc

Add State's environment UUID to the EnvUUID field of a statusDoc on creation.
Merge pull request #1233 from waigani/set-env-uuid-on-docs

State: add EnvUUID to statusDoc

Add State's environment UUID to the EnvUUID field of a statusDoc on creation.

(Review request: http://reviews.vapour.ws/r/543/)