Improve @Value properties (#2352)

Implement recommendation from https://docs.spring.io/spring-boot/reference/features/external-config.html to use kebab case for @Values:

If you do want to use @Value, we recommend that you refer to property names using their canonical form (kebab-case using only lowercase letters). This will allow Spring Boot to use the same logic as it does when relaxed binding @ConfigurationProperties.

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-dmf/hawkbit-dmf-amqp/src/main/java/org/eclipse/hawkbit/amqp/AmqpConfiguration.java

@@ -99,7 +99,7 @@ public class AmqpConfiguration {
     @ConditionalOnMissingBean
     public ErrorHandler errorHandler(
             final List<FatalExceptionStrategy> fatalExceptionStrategies,
-            @Value("${hawkbit.dmf.rabbitmq.fatalExceptionTypes:}") final List<String> fatalExceptionTypes) {
+            @Value("${hawkbit.dmf.rabbitmq.fatal-exception-types:}") final List<String> fatalExceptionTypes) {
         return new ConditionalRejectingErrorHandler(new RequeueExceptionStrategy(fatalExceptionStrategies, fatalExceptionTypes));
     }