Remove some obsolete files

Change-Id: I989d033256d40f1c08dda7639729e34e9c2e66c6
Remove obsolete python-yubico package

A more current version of the package can be found on PyPI or on GitHub

Change-Id: Ia21626e76950a373e48ac7c254aad040f19f39bd
Restructure LinOTPAdminClientCLI package

To make this package more similar to our other packages the top level
Python package was renamed from linotputils to linotpadminclientcli, the
script was moved to a bin directory and the manpage to a doc directory.

Change-Id: I0f8ee0aed14c874d7de39a690e1e11e4e9f17d55
Restructure LinOTPAdminClientGUI package

To make this package more similar to our other packages the top level
Python package was renamed from linotputilsgui to linotpadminclientgui,
the script was moved to a bin directory and the manpage to a doc
directory.

Change-Id: Ia91a9e45b47569f3f21e62c0417084789243f41c
Set __version__ in top-level package and import in setup.py

This allows the __version__ string to be used in other places and makes
it available for querying when using the package.

The pam_py_linotp was restructured a little to achieve this.

This approach is common in popular PyPI packages and was seen in boto,
requests, redis and Django.

Change-Id: Iab96abbe44819bc0827489a70625a92f134bb91a