Set FAIL_ON_UNKNOWN_PROPERTIES in DefaultConfigurationFactoryFactory

The logic is moved to DefaultConfigurationFactoryFactory from
YamlConfigurationFactory, making it easier to modify with a
custom ConfigurationFactoryFactory implementation.

There are some (uncommon) use cases where it's benefitial to
update an application without modifying the configuration, which
may fail if the application configuration has removed a configuration
property.

dropwizard-configuration/src/main/java/io/dropwizard/configuration/DefaultConfigurationFactoryFactory.java

@@ -1,5 +1,6 @@
 package io.dropwizard.configuration;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 import javax.validation.Validator;
@@ -11,6 +12,11 @@ public ConfigurationFactory<T> create(
             Validator    validator,
             ObjectMapper objectMapper,
             String       propertyPrefix) {
-        return new YamlConfigurationFactory<>(klass, validator, objectMapper, propertyPrefix);
+        return new YamlConfigurationFactory<>(
+            klass,
+            validator,
+            objectMapper.copy()
+                .enable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES),
+            propertyPrefix);
     }
 }

dropwizard-configuration/src/main/java/io/dropwizard/configuration/YamlConfigurationFactory.java

@@ -1,6 +1,5 @@
 package io.dropwizard.configuration;
 
-import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
@@ -21,7 +20,6 @@
 import javax.validation.Validator;
 import java.io.IOException;
 import java.io.InputStream;
-import java.lang.reflect.InvocationTargetException;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
@@ -69,8 +67,7 @@ public YamlConfigurationFactory(Class<T> klass,
             mapper = null;
             yamlFactory = null;
         } else {
-            mapper = objectMapper.copy()
-                    .enable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
+            mapper = objectMapper;
             yamlFactory = new YAMLFactory();
         }
         this.validator = validator;