mtreinish / stestr / 1061

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Add custom test runner and remove testtools runner dependency

Right now stestr doesn't actually own it's own test runner. It leverages
the subunit.run test runner, subunit.run in turn inherets from
testtools.run, which inherets from unittest2. The usage of unittest2
causes all sorts of problems when running non-testtools or non-unittest2
test suites, because of mismatches between stdlib unittest and unittest2.
To address this proble this commit creates a new test runner for stestr
that will emit subunit which is the actual only hard requirement for the
internal test runner used. This new test runner is more or less identical
to subunit.run, but instead of inheriting from testtools it uses stdlib
unittest directly.

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