engine: More appropriate edit message

Log messages on edit changed from '<entity> parameters changed' to
'<entity> configuration changed'

Change-Id: Ia23f6217c43ecfd09531aef1956556877810f665
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=916634
Signed-off-by: Martin Betak <mbetak@redhat.com>