Include the java7 feature in org.eclipse.jgit.feature

This way we no longer need to advertise it in the release train and can
uncategorize the jgit features without making it harder for users to
find and install the java7 feature.

Bug: 451276
Change-Id: I4c7dd0e1609fc1939d8ea83c01251dec59c228a3
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

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

@@ -22,6 +22,12 @@
       <discovery label="%updateSiteName" url="http://download.eclipse.org/egit/updates"/>
    </url>
 
+   <includes
+         id="org.eclipse.jgit.java7"
+         version="0.0.0"
+         name="Java implementation of Git - optional Java 7 libraries"
+         optional="true"/>
+
    <plugin
          id="org.eclipse.jgit"
          download-size="0"