947 line change breaks xuc user
Closes #947
The line data (line id and number, webrtc/device info) should be updated on:
- new user creation
- line number edition
- line removal followed by an addition
There are two cases to process:
- xuc startup - there's a problem in the xivo CtiServer, it is sending PhoneStatusUpdate for each line a user ever had, even for deleted line, that's why we need to go database
- xuc running - I haven't found better than to trigger the line update by the userConfigUpdate, maybe this part can be optimized, but as there're many cases I preferred to go this way for the moment