[MERGE] Updates to Tree.iter_references

[John Arbash Meinel]

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This patch has several updates to how iter_references works.

1) It should be returning the relpath rather than the abspath. There is
no way to get an abspath for RevisionTree, so it doesn't make sense to
require absolute path.

2) WT._kind(relpath) takes a relpath anyway, we were erroneously passing
in an absolute path to the function.

3) We had stopped testing RevisionTree.iter_references because it was
being backed by a WorkingTree3, which didn't support references. (It did
at the time the tests were written.)

This brings back proper testing for it, and adds tests for
DirStateRevisionTree as well.

4) This adds no-op checks to WT4 and DirStateRevisionTree when we know
that there will be no references.

I expect this will speed up some functionality, which was causing us to
stat the whole filesystem to check if there were any new tree
references. It also means the function has a stable api, since it is
properly being tested again.

John
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