[merge][#261315][1.7] RemoteBranch sets up stacking (more) correctly

[Martin Pool]

Here's an updated patch that

 * adds some helpers to test_remote so the tests are easier to read
and the failures are easier to understand
 * tests the case of a server that doesn't support this rpc
 * updates remote tests to expect Branch.get_stacked_on_url to happen
when the branch is opened

I thought I sent this last night; I'm not sure why.

-- 
Martin <http://launchpad.net/~mbp/>
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