Omdclient

Changed

- omdclient.spec - CentOS 8 support (mostly in Requires: and BuildRequires:)
- __init__.py - fixed a bad exception in loadCfg()
- __init__.py - switching from load() to `safe_load()` in loadCfg()

Changed

- init.py - decoding output from urllib requests (fixes "failed to run: a
bytes-like object is required, not 'str'" bug)

Changed

* ran all python through flake8 python linter, cleaned it up to match

Changed

* `omdclient/__init__.py` - added some docs re: `tag_role` and
`tag_instance` in the documentation (in short, we use them locally to
tie together puppet + OMD, but they're not very interesting otherwise).
* converted everything to Python 3

Removed

* dropping rpms for RHEL 6

Added

* CHANGELOG.md - standardizing on a single changelog file

Changed

* Makefile.local - now includes Pypi (pip) bindings
* setup.py, omdclient.spec - re-worked for setuptools instead of distutils.core
* README.md - lots of updates on the path towards real distribution

Removed

* TODO.md - currently empty