Checkstyle rules are not enforced for cps-ncmp-dmi-plugin

Current behaviour:
cps-ncmp-dmi-plugin build is not failing if the code is not compliant with onap and cps checkstyle rules.
See following changes having checksyle issues:

• Change in review successfully validated by Jenkins: https://gerrit.onap.org/r/c/cps/ncmp-dmi-plugin/+/122522/4/src/main/java/org/onap/cps/ncmp/service/DmiServiceImpl.java#52
• Code merged in master: https://github.com/onap/cps-ncmp-dmi-plugin/blob/master/src/main/java/org/onap/cps/ncmp/rest/controller/DmiRestController.java#L40

Expected behaviour:
cps-ncmp-dmi-plugin build is failing when the code contains checkstyle violations