Fixing sonar issues in whole file
https://sonar.onap.org/dashboard?id=org.onap.appc%3Aappc-design-services-provider%3Asrc%2Fmain%2Fjava%2Forg%2Fonap%2Fappc%2Fdesign%2Fservices%2Futil%2FArtifactHandlerClient.java