Fix accelerator typo for adapters
KillSwitch.py - RfKill Detection

* KillSwitch.py Needs Rfkill support loaded by kernel in order to
 function properly. If /dev/rfkill is not found, don't load the plugin
Detect when Deleted already Deleted Device object

Python does not guarantee that an object upon which __del__ is called
will still exist, so we cannot do any self.Foo after  __del__ reliably
Add SIGTERM handling to more applications