setup.py will not install package_data this is just an empty
directory, even if the globs in package_data match it.

So the role skeleton that was being installed to galaxy/data/*/
was excluding the files/ and templates/ directories since they were
empty.

Since the skeleton dir doesnt include those dirs
'ansible-galaxy init' would not set them up.

So this adds a .* glob to those directories so the .git_keep
will be included as well, so that setup.py will create the otherwise
empty directoty. ansible-galaxy init already knows to ignore those
files, so no other changes are needed.

(Including the .git_keep files is a little odd, but the alternative
would be creating our own placeholder files. Since ansible-galaxy
already understands .git_keep files we just reuse that)

Fixes #23597

pip can't handle zip files with symlinks.  Attempt to workaround that by
transforming the bin scripts into symlinks after the zip file has been
unarchived into the build tree.

Mechanical edit done by this "one-liner":

```Shell
git ls-files -z "$(git rev-parse --show-toplevel)" | xargs --null -I '{}' find '{}' -type f -print0 | xargs --null sed --in-place --regexp-extended 's#http://(www\.|galaxy\.|)ansible\.com#https://\1ansible.com#g;'
```

Related to: https://github.com/ansible/ansible/issues/16869

Move to using a requirements.txt to install the python packages.

This makes it easy to keep the documentation and actual package
dependencies in sync.

Fixes #18453

At the moment, this change will use EPoll on Linux, KQueue on *BSDs,
etc, so it should alleviate problems with too many open file
descriptors.

* Bundle a copy of selectors2 so that we have the selectors API everywhere.
* Add licensing information to selectors2 file so it's clear what the
  licensing terms and conditions are.
* Exclude the bundled copy of selectors2 from our boilerplate code-smell test
* Rewrite ssh_run tests to attempt to work around problem with mocking
  select on shippable

Fixes #14143

* PEP 8 E121 cleanup.

* PEP 8 E126 cleanup.

* PEP 8 E122 cleanup.