Github actions added to perform lint and compile

Github actions added to perform lint and compile

In the test folder, there was lint.sh, but I think flake8 is a better
tool.

Added a compile job for linux, this runs compilation as defined in
the README, runs a sample mtr and runs cmdparse.py test. Need
documentation on what other tests to run and whether to include the
testing in tox instead of running them individually.

Not adding in this PR support for cygwin or freebsd, as that will need
investigation on how to run.

Minor:
- Fixed a typo in configure.ac that used ---- vs -- for a flag option.