ajp-client: don't use ajp_connection_close() in request_abort()
ajp-client: don't use ajp_connection_close() in request_abort()

This call suppressed the "real" code of ajp_connection_close(), and
the only thing it really did was call ajp_client_release().

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy