Multi release sources (#4366)

* Multirelease sources are added in package phase

Signed-off-by: Jorge Bescos Gascon <jorge.bescos.gascon@oracle.com>

ext/wadl-doclet/pom.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-    Copyright (c) 2012, 2019 Oracle and/or its affiliates. All rights reserved.
+    Copyright (c) 2012, 2020 Oracle and/or its affiliates. All rights reserved.
 
     This program and the accompanying materials are made available under the
     terms of the Eclipse Public License v. 2.0, which is available at
@@ -182,7 +182,7 @@
                         <executions>
                             <execution>
                                 <id>copy-jdk12-sources</id>
-                                <phase>verify</phase>
+                                <phase>package</phase>
                                 <configuration>
                                     <target>
                                     	<property name="sources-jar" value="${java8_11.build.outputDirectory}/${project.artifactId}-${project.version}-sources.jar"/>