[MERGE] fix up test_bench_history

[Aaron Bentley]

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Hi all,

test_bench_history is inappropriately affected by the cwd.

Specifically, it assumes that it is being run from a bzr.dev tree, and
will fail if 'bzr selftest test_bench_history' is run in a directory
other than the bzr tree.

This bundle fixes that by opening the tree containing the module under test.

It also nices up the test, changing a convoluted way of getting
last_revision to the standard way, and using assertEndsWith instead of
assert_(str.endswith)

And no, there's no pattern that matches revision-ids in general.  They
are free-form*.  You could probably write a pattern to match the ones
generated by bzr, at least right now, but it could go out of date.

Aaron

* technically, revision ids ending in ':' are reserved, and ':' is
otherwise used to separate namespaces, but these are just conventions.
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