rdt: Bring back the explicit CNAME query

This partially reverts b0195147f354af3f546716b41fad372c8b74e222, because
ANY queries still follow cnames, causing funny output like

foo = 1.2.3.4, bar, baz
    1.2.3.4 = baz

instead of the expected

foo = bar
    bar = baz
        baz = 1.2.3.4
	    1.2.3.4 = baz
tube: use .m4a for just audio