This corrects some problems in our test suites that have recently been

uncovered, some of which were found during the move to pytest.
We had some stdout/stderr capture code that was nose-specific. We

weren't capturing stdout at all, leaving that to nose. We now

capture both.
Some SVN common test mixin code was being executed under pytest. We now

set __test__ = False to avoid this.
The new versions of Haystack regressed a test, due to an attempt to spy

on a function wrapped in a misbehaving decorator (which did not preserve

the function name). This is addressed in kgb 7 through the new

func_name= argument, which is now used by this test.
A check for rb-site output was testing results in a Python-specific way.
Some SSH key comparisons for the SCM tests compared against None using

==, which triggered a broken code path in paramiko. We now compare

using is.

Verified these fixed the corresponding unit tests in both the pytest and

nose test runners.