[SPARK-5155] Build fails with spark-ganglia-lgpl profile

Build fails with spark-ganglia-lgpl profile at the moment. This is because pom.xml for spark-ganglia-lgpl is not updated.

This PR is related to #4218, #4209 and #3812.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #4303 from sarutak/fix-ganglia-pom-for-metric and squashes the following commits:

5cf455f [Kousuke Saruta] Fixed pom.xml for ganglia in order to use io.dropwizard.metrics

extras/spark-ganglia-lgpl/pom.xml

@@ -42,7 +42,7 @@
     </dependency>
 
     <dependency>
-      <groupId>com.codahale.metrics</groupId>
+      <groupId>io.dropwizard.metrics</groupId>
       <artifactId>metrics-ganglia</artifactId>
     </dependency>
   </dependencies>