Exclude SYSTEM audit db from generic audit.query

The SYSTEM audit database records a large number of events since
it's being fed by auditd. This means we probably don't want
to overload users with its results in our UI.

src/middlewared/middlewared/plugins/audit/audit.py

@@ -39,7 +39,7 @@
 
 
 ALL_AUDITED = [svc[0] for svc in AUDITED_SERVICES]
-BULK_AUDIT = ['SMB']
+BULK_AUDIT = ['SMB', 'SYSTEM']
 NON_BULK_AUDIT = [svc for svc in ALL_AUDITED if svc not in BULK_AUDIT]
 
 # We set the refquota limit