External file removal fix

External file removal fix

[Issue#]       N/A
[Bug]          Broken wigdet update in database cause some widget's files may be removed
[Cause]        External files were removed before registeration of new version of widget.
This causes lost of file if file was in previous version (have been removed before registerWidget) but not in current/used by update version of widget.
[Solution]     Fix of database step
[Verification] Check if installer install and uninstall widgets with livebox confiugration. Configuration file should:
-> be present in database after installation.
-> should be removed in uninstallation (and mentioned in logs)
Additonally:
1. Install widget
2. Manipulate database to add non-existing locations.
3. During updating(or -if installation) or uninstalling this files should be listed as external files to be removed but not existing(warning in logs)

Change-Id: I2f365236c0cd1b7ac96fa8fedcc60d542402ac87