core: Fix dal test logging configuration

Fix the logging configuration in the dal module's tests:
* Make sure each category has appenders
* Remove useless categories
* Fix typo in the ErrorHandler

Change-Id: I0432e7618ee8d9b7671a025b6fee0fad49a161c8
Signed-off-by: Allon Mureinik <amureini@redhat.com>