NewManager returns a *Manager which uses the provided ServiceServiceClient to perform actions on Sessions and Connections on the Controller.

ValidateSessionTimeout is the duration of the timeout when the worker queries the controller for the sessionId for which the connection is being requested.

CloseCallTimeout is a timeout value FIXME: This is really ugly -- but not as ugly as plumbing this value into the interface.

ConnectionCloseData encapsulates the data we need to send via CloseConnection RPC to the controller.

ConnInfo defines the information about a connection attached to a session.

Manager stores session information locally and exposes ways to operate on the set of sessions locally in batch.

Session is the local representation of a session.