Moving screen locking away from krunner

[Davide Bettio]

Hello,

I think that screen locking should be moved away from krunner for some  
reasons:

1) When krunner crashes screen locking stops to work, an always  
working screen locking is really important for security and privacy  
reasons.

2) it seems that screen locking doesn't work while running plasma  
netbook shell (krunner is not running in plasma netbook).

3) I don't see any logical reason about why screen locking should be there.

Bye,
Davide Bettio.