Fixing sonar issues in whole file
https://sonar.onap.org/code?id=org.onap.appc%3Aappc&selected=org.onap.appc%3Aappc-config-audit-provider%3Asrc%2Fmain%2Fjava%2Forg%2Fonap%2Fsdnc%2Fconfig%2Faudit%2Fnode%2FCompareNode.java