This is no longer necessary. One test needs to be modified to deal with
how 'python -m pytest' modifies the PATH.

Signed-off-by: Stephen Finucane <stephen@that.guru>

Per the pytest docs [1], this is the preferred way to ignore tests. This
necessitates removing the 'test-async' target as it no longer makes any
sense.

[1] https://docs.pytest.org/en/latest/example/pythoncollection.html

Signed-off-by: Stephen Finucane <stephen@that.guru>

utils: Remove the 'reindent' tool

There are still a couple of checks here but all of them can be removed
now:

- Check if using valid Python syntax
- Check if line length too long
- Check if using 'x == None/True/False'
- Check if using old HTML 3 tags

The first three are already handled by default by the 'flake8' tool. The
last one isn't replaced by anything, but it really isn't worth worrying
about now because the tags it checks for have been dead for a really
long time and would not be used by anyone writing HTML in the last 10
years. Combined, it means we can remove the entire file.

The 'style-check' target is updated to simply alias 'flake8'. It can be
removed in a future release. This allows us to stop using this target in
the Travis jobs, seeing as we already run flake8.

Signed-off-by: Stephen Finucane <stephen@that.guru>

Nobody seems to be using this, probably because of the 'flake8' target,
and it hasn't been touched, some Python/flake8 updates aside in years.
Just remove it.

The Make target is not removed to both give us time to warn users that
the target is gone and, more importantly, to prevent merge conflicts
with other patches being submitted at the same time.

Signed-off-by: Stephen Finucane <stephen@that.guru>