[PATCH remotenames-ext] tests: fix for new upstream behavior

[Sean Farley]

Ryan McElroy <rm at fb.com> writes:

> # HG changeset patch
> # User Ryan McElroy <rmcelroy at fb.com>
> # Date 1457097073 28800
> #      Fri Mar 04 05:11:13 2016 -0800
> # Node ID 32c0d1eeca9d9a597dcdb984dfaf17aef93a002e
> # Parent  f9b5c42caba3e4a76c1c2ee5ef78f3baf216273b
> tests: fix for new upstream behavior
>
> Core hg added rebase destination logic which changed the behavior of `hg rebase`
> and `hg pull --rebase`. Update the tests to account for these changes.

This breaks tests with hg 3.7.2 (and before). Should we care about that?