Title: windows_updates: Fix missing warning if reboot required in case forced reboot is in the past
Level: 1
Component: checks
Class: fix
Compatible: compat
State: unknown
Version: 1.2.7i1
Date: 1428677837

If the plugin reports the next forced reboot to lie in the past then
the check did not warn anymore about a neccessary reboot for applying
the installed patches. Also the code was cleaned up on the dependency
to the Python module <tt>datetime</tt> has been removed.
