cbq-engine memory usage grows indefinitely when audit is enabled

diff --git a/audit/audit.go b/audit/audit.go

index 977cc838..c6d78f68 100644

--- a/audit/audit.go

+++ b/audit/audit.go

@@ -59,7 +59,7 @@ type Auditable interface {

        IsAdHoc() bool

 }

-var doAudit = false

+var doAudit = true

 var doLogAuditEvent = false

 // Event types are described in /query/etc/audit_descriptor.json