NetworkManager: Several Bug fixes

This update fixes the following issue for NetworkManager:
- bnc#768564: This fix avoids APs from being removed on disconnect.
- bnc#780911: Remove dbus-system-service for NetworkManager, to prevent warnings about it not being running

Fixed bugs
bnc#768564
Network Manager does not connect to wireless automatically during startup
bnc#780911
dbus-org.freedesktop.NetworkManager.service
Selected Binaries
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