Add the accounts service to status manager. This will allow us to query
the status of the accounts service and see if it is running or not.
For incoming gRPC requests to the accounts service, we also use the
status manager to check if the accounts service is running or not to
determine if we should let the request through or not.
Pass the status manager to the sub-server manager so that the sub-server
manager can inform the status manager of any sub-servers that have
started or failed to start.