packaging: doc: extract AuditLogMessages.properties as doc for notifier

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1084138
Change-Id: Ifb6d56511011e76aebd3b0dc558d8c2f9c94d2d1
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>