implemented restarter to move control over the restart process to the core

scm-test/src/main/java/sonia/scm/lifecycle/RestartEventFactory.java

@@ -0,0 +1,15 @@
+package sonia.scm.lifecycle;
+
+/**
+ * Creates restart events for testing.
+ * This is required, because the constructor of {@link RestartEvent} is package private.
+ */
+public final class RestartEventFactory {
+
+  private RestartEventFactory(){}
+
+  public static RestartEvent create(Class<?> cause, String reason) {
+    return new RestartEvent(cause, reason);
+  }
+
+}