Merge patch series "Tidy up console recording in tests"

Merge patch series "Tidy up console recording in tests"

Simon Glass <sjg@chromium.org> says:

This series started as a small fix for checking for an empty line,
but in the process several other problems were found and fixed:

- fix tests which use console recording but don't set the flag
- drop unnecessary resetting of the console in tests
- drop unnecessary blank line before MMC output
- update the docs a little
- fix buildman test failure on newer Pythons
- a few other minor things

This series also renames the confusing flag names, so that they are
easier to remember - just a UTF_ (unit-test flags) prefix.