Add org.eclipse.jgit.java7.source to jgit source feature

Change-Id: Ifd9153f77c246a67d5d15734667dc2360718a390
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/feature.xml

@@ -28,4 +28,10 @@
          install-size="0"
          version="0.0.0"
          unpack="false"/>
+   <plugin
+         id="org.eclipse.jgit.java7.source"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
 </feature>

org.eclipse.jgit.packaging/pom.xml

@@ -103,6 +103,12 @@
       <version>${project.version}</version>
       <classifier>sources</classifier>
     </dependency>
+    <dependency>
+      <groupId>org.eclipse.jgit</groupId>
+      <artifactId>org.eclipse.jgit.java7</artifactId>
+      <version>${project.version}</version>
+      <classifier>sources</classifier>
+    </dependency>
     <dependency>
       <groupId>org.eclipse.jgit</groupId>
       <artifactId>org.eclipse.jgit.pgm</artifactId>