Fix the shebang of the python script to use /usr/bin/env, allowing to
call the script directly from a virtualenv with `./release-estimator.py`
without using the python3 install of the system.
The CHANGELOG URL which is parsed in the HTML now have a relative
scheme, which is incompatible with requests. This patch adds an https
scheme to the URL.
The following components were moved to admin/ because they're generally
used in field by admins:
iprange/ netsnmp-perl/ selinux/ systemd/ wireshark-dissectors/
syntax-highlight/ release-estimator/
