It seems, if audit itself is not installed and therefore nothing listens
to the messages from the kernel's audit subsystem, the latter spams the
kernel log with such messages.

Let us make them debug-level and thus invisible by default.

http://bugs.rosalinux.ru/show_bug.cgi?id=6235
http://bugs.rosalinux.ru/show_bug.cgi?id=6459

diff --git a/kernel/audit.c b/kernel/audit.c
index ba4481d..1f19177 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -490,7 +490,7 @@ static void kauditd_printk_skb(struct sk_buff *skb)
 	char *data = nlmsg_data(nlh);
 
 	if (nlh->nlmsg_type != AUDIT_EOE && printk_ratelimit())
-		pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
+		pr_debug("type=%d %s\n", nlh->nlmsg_type, data);
 }
 
 /**