Add the EnvUser with tests. Create an Environment user during bootstrap

Added the EnvUser doc

Support for setting the last login time for the EnvUser

Added a factory for adding the envuser

Admin EnvUser gets added at bootstrap time

Removed a couple of attributes from the upgrade package that no longer needed to be there

Inside the namespace of a type identifiers may be abbreviated. But on a package level, especially on a large one like state, I would prefer `EnvironmentUser()` and `AddEnvironmentUser()` etc.