Encode output.print_error message to avoid UnicodeEncodeError when displaying errors

[prilr]

When leapp executes in a Python 2 environment, an actor encountering an error can cause further issues if the message string provided to leapp.utils.output contains non-ASCII characters.

This line in output.py is the main problem:

sys.stdout.write("{red}{time} [{severity}]{reset} Actor: {actor}\nMessage: {message}\n".format(
        red=Color.red, reset=Color.reset, severity=model.severity.upper(),
        message=model.message, time=model.time, actor=model.actor))

As you can see, this line isn't Unicode in Python 2, which is why trying to format it with u-strings directly will end up causing an error like the one below:

Dec 05 08:19:44 localhost upgrade[437]: Traceback (most recent call last):
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/bin/leapp", line 9, in <module>
Dec 05 08:19:44 localhost upgrade[437]:     load_entry_point('leapp==0.14.0', 'console_scripts', 'leapp')()
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/cli/__init__.py", line 37, in main
Dec 05 08:19:44 localhost upgrade[437]:     cli.command.execute('leapp version {}'.format(VERSION))
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/utils/clicmd.py", line 106, in execute
Dec 05 08:19:44 localhost upgrade[437]:     args.func(args)
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/utils/clicmd.py", line 128, in called
Dec 05 08:19:44 localhost upgrade[437]:     self.target(args)
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/cli/commands/upgrade/breadcrumbs.py", line 94, in wrapper
Dec 05 08:19:44 localhost upgrade[437]:     return f(*args, breadcrumbs=breadcrumbs, **kwargs)
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/cli/commands/upgrade/__init__.py", line 101, in upgrade
Dec 05 08:19:44 localhost upgrade[437]:     report_errors(workflow.errors)
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/utils/output.py", line 100, in report_errors
Dec 05 08:19:44 localhost upgrade[437]:     print_error(error)
Dec 05 08:19:44 localhost upgrade[437]:   File "/usr/lib/python2.7/site-packages/leapp/utils/output.py", line 48, in print_error
Dec 05 08:19:44 localhost upgrade[437]:     message=model.message, time=model.time, actor=model.actor))
Dec 05 08:19:44 localhost upgrade[437]: UnicodeEncodeError: 'ascii' codec can't encode character u'\u2192' in position 389382: ordinal not in range(128)
Dec 05 08:19:44 localhost upgrade[433]: Container sysroot failed with error code 1.

This results in the actor error itself not being displayed, only the subsequent UnicodeEncodeError exception.

I'm not sure the way I went about correcting the problem in this PR is the optimal one.
If there's a different solution you'd rather see, please let me know.

[github-actions]

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[leapp-bot]

This PR has been linked in issue tracker (OAMG-8043).

[fernflower]

Code looks ok, but I am really missing a unit test that covers this particular case. Could you please add one?

[fernflower]

@prilr Added a really naive unit test, checked it failed on py2.7 if applied on master.

If you are ok with the changes, please squash previous 5 commits into one and let's merge it :)

[fernflower]

/rerun

[github-actions]

Copr build succeeded: https://copr.fedorainfracloud.org/coprs/build/5309507

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Testing Farm request for RHEL-8.6-rhui/5290656;5309507 regression testing has been created.
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Testing Farm request for RHEL-7.9-ZStream/5290656;5309507 regression testing has been created.
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[github-actions]

Testing Farm request for RHEL-7.9-ZStream/5290656;5309507 regression testing has been created.
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[fernflower]

So I went on and squashed the commits :) Thanks for the contribution!