Forgot that source classes should check if the path the the setting file is correct

Signed-off-by: emanuele <emanuele45@gmail.com>
Move all the common code to the AbstractSourceImporter::loadSettings until we will stop including files in favour of parsing them to avoid globals conflicts

Signed-off-by: emanuele <emanuele45@gmail.com>
Remove some more hard-coded Elk/SMF/Wedge-specificity

Signed-off-by: emanuele <emanuele45@gmail.com>