Fixing sonar issues in whole file
https://sonar.onap.org/dashboard?id=org.onap.appc%3Aappc-config-generator-provider%3Asrc%2Fmain%2Fjava%2Forg%2Fonap%2Fsdnc%2Fconfig%2Fgenerator%2Ftool%2FJSONTool.java