Removed log4j from af3 feature.xml

Removed plugin form feature.xml.

Issue-Ref: 4185
Issue-Url: af3#4185

Signed-off-by: Andreas Bayha <bayha@fortiss.org>

org.fortiss.af3.phoenix.feature/feature.xml

@@ -830,13 +830,6 @@ limitations under the License.
          version="0.0.0"
          unpack="false"/>
 
-   <plugin
-         id="org.apache.log4j"
-         download-size="0"
-         install-size="0"
-         version="0.0.0"
-         unpack="false"/>
-
    <plugin
          id="org.eclipse.jdt.junit.runtime"
          download-size="0"