more plugin cleanup

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@1082 f203690c-595d-4dc9-a70b-905162fa7fd2

pom.xml

@@ -160,22 +160,6 @@
           </execution>
         </executions>
       </plugin>
-      <plugin>
-        <groupId>org.codehaus.mojo</groupId>
-        <artifactId>cobertura-maven-plugin</artifactId>
-        <configuration>
-          <instrumentation>
-          </instrumentation>
-        </configuration>
-        <executions>
-          <execution>
-            <id>clean</id>
-            <goals>
-              <goal>clean</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-changes-plugin</artifactId>