[POLICY-12] tackle policy-persistence/DBaudit.java

[POLICY-12] tackle policy-persistence/DBaudit.java

Deals with the following reports:

Description Resource Path Location Type
Resource leak: 'statement' is not closed at this location DbAudit.java
/policy-persistence/src/main/java/org/openecomp/policy/drools/core
line 135 Java Problem

Description Resource Path Location Type
Resource leak: 'statement' is not closed at this location DbAudit.java
/policy-persistence/src/main/java/org/openecomp/policy/drools/core
line 142 Java Problem

Description Resource Path Location Type
Resource leak: 'statement' is not closed at this location DbAudit.java
/policy-persistence/src/main/java/org/openecomp/policy/drools/core
line 160 Java Problem

Change-Id: I16c6698ee9b659add11d3bc62abb38a3d1792049
Signed-off-by: Jorge Hernandez <jh1730@att.com>