* Clean up some dev config kms code
Although it didn't matter in the combined state, the KMS for auth
storage was not actually being set properly if only a worker was being
instantiated.
* Adds WorkerAuthStorage wrapper for worker credential encryption using nodeenrollment library.
* Adds AuthStoragePath field in worker config and dev mode to specify directory to store credentials.
* Move the server daemons into their own package
With this change the internal/server package now is dedicated to the server domain (workers and controllers) and not to the server daemons.
The hope is that this will make it easier to keep the daemons decoupled from the representation of the servers in the database.
Jeff Mitchell
Todd
Haotian