remove unused imports

Signed-off-by: Jean-Baptiste Trystram <[email protected]>

Author: jbtrystram

services/device-registry-base/src/main/java/org/eclipse/hono/service/management/device/DelegatingDeviceManagementHttpEndpoint.java

@@ -29,9 +29,7 @@
 import org.eclipse.hono.service.management.AbstractDelegatingRegistryHttpEndpoint;
 import org.eclipse.hono.service.management.Id;
 import org.eclipse.hono.service.management.OperationResult;
-import org.eclipse.hono.service.management.Result;
 import org.eclipse.hono.tracing.TracingHelper;
-import org.eclipse.hono.util.CacheDirective;
 import org.eclipse.hono.util.RegistryManagementConstants;
 
 import io.opentracing.Span;