Move parsec to cylc.parsec

[kinow]

Close #2880

Simply moves the old parsec module now to cylc.parsec. This will reduce the number of modules exported after the user installs cylc via pip/conda/etc.

This reduces too the risk of package collision, as there is another parsec package already in PYPI that could be using the parsec namespace already.

pytest and cylc run five passed locally. Making it a draft until functional tests have passed as well.

Cheers
Bruno

[kinow]

Also fixes some left overs of setup.py, like remove some exclusions from Codacy configuration file.

[matthewrmshin]

Two comments to fix the horrors introduced by me!

[kinow]

I noticed that the functional tests from parsec were in the wrong folder. Correcting it, they were not passing once put under the /tests/ folder. Something with the Python code that is loaded there... so I modified the Python code a bit (just eliminated the need for lib/python/config.py by moving all the code to bin/synonym.py), and now it should - hopefully 🤞 - pass in Travis.

[kinow]

This was initially for parsec, but then I realized we were missing a few more lines from other folders removed recently. That's why there are multiple lines here 👍

[kinow]

Interesting. Promoting a draft pull request to ready-to-review does not trigger Travis. So there's only one check here.

I waited until Travis builds passed for my fork though: https://travis-ci.org/kinow/cylc-flow/builds/526686529

So it should be OK, hopefully.

[kinow]

A-ha! The old close pull request, open pull request trick. Travis build triggered!

[matthewrmshin]

Comment on Python 2.6 back compat logic. Otherwise good to go.

[matthewrmshin]

Sorry, but we should still add the LOG.addHandler(logging.NullHandler()) statement, just without the need for the if ... test.

[kinow]

Oh, that line had to stay? No problemo. Done in cc6ed7d

[matthewrmshin]

Will merge when CI is done.