Fixing sonar issues in whole file
https://sonar.onap.org/code?id=org.onap.appc%3Aappc&selected=org.onap.appc%3Aappc-artifact-handler-provider%3Asrc%2Fmain%2Fjava%2Forg%2Fonap%2Fappc%2Fartifact%2Fhandler%2Fdbservices%2FDBService.java