Cleanup shebang and executable bit

- Add missing executable bits to all scripts
- Remove executable bits from all files that are not scripts,
  e.g. js, html, and Python libraries.
- Remove Python shebang from all Python library files.

It's frown upon to have executable library files in site-packages.

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Armando Neto <abiagion@redhat.com>

pypi/test_placeholder.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # Copyright (C) 2017  FreeIPA Contributors see COPYING for license
 
 import importlib