Remove unused import

Author: adelapena

src/java/org/apache/cassandra/db/monitoring/MonitoringTask.java

@@ -36,7 +36,6 @@
 
 import org.apache.cassandra.concurrent.ScheduledExecutors;
 import org.apache.cassandra.config.CassandraRelevantProperties;
-import org.apache.cassandra.config.Config;
 import org.apache.cassandra.utils.NoSpamLogger;
 
 import static java.lang.System.getProperty;