public static Long executeOn(ServerLocation location, ExecutablePool pool) {
    AbstractOp op = new AuthenticateUserOpImpl();
    return (Long) pool.executeOn(location, op);
  }
Sends the auth credentials to the server. Used in single user mode of authentication.

@param location The ServerLocation instance whose connection instance will be used to perform
       the operation.
@param pool The connection pool to use for this operation.
@return Object unique user-id.
geode-core/src/main/java/org/apache/geode/cache/client/internal/AuthenticateUserOp.java