Ian Wienand 878b20898d Drop Python 2 support
This has bit-rotted as libraries have updated to Python 3 only.

Switch to hacking; some minor changes to regex-strings is all that is
required.

Drop py27 markers and move to Python 3 only.  Update requirements.

Depends-On: https://review.opendev.org/737666
Change-Id: Iabf201965129b3284166e1aedcb9f1c9d6109077
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