Fixing tests to handle changes in our behaviour since DOM 3.

Fixing tests to handle changes in our behaviour since DOM 3.

Our exception priority has changed for DOM attributes. We
previously used to throw DOMExceptions with namespace error
codes and now throw DOMExceptions with character error codes
when the attribute name is malformed. This caused changes to
many tests.

Another notable behaviour change is that we now supply the
qname (like the RI) where previously we did not. It is optional,
but we now include it for RI-consistency.

Yet another behaviour change is that we don't look at System
properties when choosing a SAX implementation. This simplifies
our internals significantly. End users who want an alternative
SAX implementation should construct it manually.

Also adding @KnownFailure tags for new tests that we have
never yet passed.

Change-Id: I6f81bedd7c2a0867086dc507b3220c2b07c4d3d3