[Bael 6099] - Add "core-java-10" and "core-java-11" modules (#4125)

* Added parent module on poms that have no parent defined

* Removed dependency reduced pom from undertow module

* [BAEL-6099] - Added core-java-10 and core-java-11 modules

* [BAEL-6099] - Added core-java-10 and core-java-11 modules

* [BAEL-6099] - Enforced compiling to a particular version

* [BAEL-6099] - Enforced compiling to a particular version

core-java-10/src/main/java/com/baeldung/App.java

@@ -0,0 +1,13 @@
+package com.baeldung;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello World!" );
+    }
+}