Remove unittest2, return to unittest #6062
Merged
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We are currently using a custom-modified unittest2, which itself was a modified version of the standard library package unittest.
Originally, unittest2 allowed people to use later versions of unittest in early 2.* versions of python. It also backported certain utilities from python's 3.4 version of unittest back to python2.
We don't use python2 anymore. We don't need unittest2 anymore. This commit removes all unittest2 and removes the custom unittest2 dependency.