macOS 11 is not longer an available runner on Azure Devops. The minimum is now
macOS 12. This runner does not have Python 2.7 installed, so running them
would require a custom install - which I'm declaring too much effort for too
little gain.
refs #1090
* ansible: use unicode_literals everywhere since it only needs to be
compatible back to 2.6.
* compat/collections.py: delete this entirely and rip out the parts of
functools that require it.
* Introduce serializable Kwargs dict subclass that translates keys to
Unicode on instantiation.
* enable_debug_logging() must set _v/_vv globals.
* cStringIO does not exist in 3.x.
* Treat IOLogger and LogForwarder input as latin-1.
* Avoid ResourceWarnings in first stage by explicitly closing fps.
* Fix preamble_size.py syntax errors.
Alex Willmer