🐛 [Core] Added missing error message for KapuaEntityUniquenessException #2438

Job	Run time
Build	5m 32s
test-broker	5m 49s
test-tag	2m 36s
test-brokerAcl	5m 49s
test-connection	5m 49s
test-datastore	5m 50s
test-device	5m 13s
test-device-management	5m 50s
test-jobsAndScheduler	2m 50s
test-jobsIntegration	5m 49s
test-jobsIntegrationBase	5m 48s
test-security	5m 26s
test-user	3m 52s
test-userIntegration	5m 48s
test-userIntegrationBase	5m 47s
test-jobEngineRestartOfflineDevice	5m 47s
test-accountAndTranslator	5m 49s
test-jobEngineRestartOnlineDevice	5m 46s
test-jobEngineRestartOnlineDeviceSecondPart	5m 47s
test-jobEngineServiceStop	5m 48s
test-jobEngineStartOfflineDevice	5m 47s
test-jobEngineStartOnlineDevice	5m 48s
test-jobEngineStepDefinitions	5m 48s
test-RoleAndGroup	2m 51s
build-javadoc	5m 50s
junit-tests	46s
test-api-auth	5m 45s
test-deviceRegistry	5m 47s
test-endpoint	5m 47s
test-api-corsfilter	1s
	2h 30m 55s

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