[XML-SIG] DOM test failures

[Rich Salz]

Someone COULD use DOM Level 1 API to create a namespace-correct DOM
	e = createElement("foo:elt", ...)
	e.createAttribute("xmlns:foo", "http://example.com")
but that seems highly unlikely.  I'd follow Fred's suggestion and raise
an error if trying to create something with a colon in the name,
otherwise fall through to the Level2 routines with EMPTY_NAMESPACE.

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