Univention Corporate Server 3.2 erratum 107 (bugfix)

This update fixes the following issues:
* The S4 connector Python modules are now only built for Python 2.6
* The pcpatch user is no longer ignored by default
* The start of multiple S4 connector instances is now prevented
* When creating a user in UCS a stronger password is used which
  fulfill the password complexity settings
* The UCR variable connector/s4/listener/disabled has been added.
  If it is set to true the listener does not write any changes.
  This is helpful on a domain controller backup. The variable is
  not set by default during this upgrade.
* During the group membership synchronization from Samba 4 to
  OpenLDAP an object mapping problem has been fixed.