undid that *Config classes were Java Serializable

* removed them from Akka "Props" for actors whose props must be serializable (e.g. sharded actors)
* replaced Props "Creator" (and lambda) approach (which is not per default serializable) with "props with varargs" approach
* moved common "health-check", "cluster", "http", "metrics" configs to toplevel "ditto" - extracted those as separate files included in ditto-service-base.conf
* removed "testSerializationAndDeserialization" tests

Signed-off-by: Thomas Jaeckle <thomas.jaeckle@bosch-si.com>

bom/pom.xml

@@ -36,8 +36,8 @@
         <minimal-json.version>0.9.5</minimal-json.version>
         <typesafe-config.version>1.3.3</typesafe-config.version>
         <ssl-config-core.version>0.3.7</ssl-config-core.version>
-        <akka.version>2.5.22</akka.version>
-        <akka-http.version>10.1.7</akka-http.version>
+        <akka.version>2.5.23</akka.version>
+        <akka-http.version>10.1.8</akka-http.version>
         <akka-persistence-mongo.version>2.2.4</akka-persistence-mongo.version>
         <akka-management.version>1.0.0</akka-management.version>
         <simple-akka-downing.version>0.9.2</simple-akka-downing.version>

services/base/src/main/java/org/eclipse/ditto/services/base/DittoService.java

@@ -108,7 +108,7 @@ public abstract class DittoService<C extends ServiceSpecificConfig> {
     /**
      * The config path expression which points to the supposed nested config with the Ditto settings.
      */
-    public static final String DITTO_CONFIG_PATH = "ditto";
+    public static final String DITTO_CONFIG_PATH = ScopedConfig.DITTO_SCOPE;
 
     private final Logger logger;
     private final String serviceName;
@@ -163,7 +163,7 @@ private static ScopedConfig tryToGetDittoConfigOrEmpty(final Config rawConfig) {
 
     private static ScopedConfig getDittoConfigOrEmpty(final Config rawConfig) {
         if (rawConfig.hasPath(DITTO_CONFIG_PATH)) {
-            return DefaultScopedConfig.newInstance(rawConfig, DITTO_CONFIG_PATH);
+            return DefaultScopedConfig.dittoScoped(rawConfig);
         }
         return DefaultScopedConfig.empty(DITTO_CONFIG_PATH);
     }