initial add of EbeanORM server based on v2.8.1

src/main/java/com/avaje/ebeaninternal/api/SpiBackgroundExecutor.java

@@ -0,0 +1,14 @@
+package com.avaje.ebeaninternal.api;
+
+import com.avaje.ebean.BackgroundExecutor;
+
+/**
+ * Internal Extension to BackgroundExecutor with shutdown.
+ */
+public interface SpiBackgroundExecutor extends BackgroundExecutor {
+
+	/**
+	 * Shutdown any associated thread pools.
+	 */
+	public void shutdown();
+}