rpm: Fix broken link
rpm: Fix broken link

Before:
apache-cassandra.jar -> /usr/share/apache-cassandra-2.1.8-SNAPSHOT.jar

After:
apache-cassandra.jar -> /usr/share/scylla/cassandra/apache-cassandra-2.1.8-SNAPSHOT.jar

scylladb/scylla-tools-java,scylladb/scylla-tools-java,scylladb/scylla-tools-java,scylladb/scylla-tools-java