func NewBasicAuthenticator(username, password string, accountID int) Authenticator {
	builder := basicLoginRequestBuilder{username: username, password: password, accountID: accountID}
	return newCookieSigner(&builder, accountID)
}
func NewBasicAuthenticator(username, password string, accountID int) Authenticator {
	builder := basicLoginRequestBuilder{username: username, password: password, accountID: accountID}
	return newCookieSigner(&builder, accountID)
}
// NewBasicAuthenticator returns a authenticator that uses email and password to create sessions.
// The returned authenticator takes care of refreshing the RightScale session as needed.