Fix classpath file creation for eclipse
Fix classpath file creation for eclipse

Patch by Yash Ladha; reviewed by Benjamin Lerer and Berenguer Blasi for CASSANDRA-17294

When building the eclipse file for development, `.classpath` file was
not correctly generated as it was not getting closed. Also there were
missing third-party libs that were essential for development.

This commit fixes the generation of classpath for
`generate-eclipse-files` command.

thelastpickle/cassandra,thelastpickle/cassandra,thelastpickle/cassandra,tjake/cassandra,instaclustr/cassandra,mshuler/cassandra,jrwest/cassandra,apache/cassandra,tjake/cassandra,adelapena/cassandra,blambov/cassandra,pauloricardomg/cassandra,jrwest/cassandra,pauloricardomg/cassandra,mike-tr-adamson/cassandra,thelastpickle/cassandra,pauloricardomg/cassandra,instaclustr/cassandra,jrwest/cassandra,apache/cassandra,belliottsmith/cassandra,mike-tr-adamson/cassandra,adelapena/cassandra,tjake/cassandra,blambov/cassandra,adelapena/cassandra,mshuler/cassandra,mike-tr-adamson/cassandra,instaclustr/cassandra,adelapena/cassandra,blambov/cassandra,belliottsmith/cassandra,belliottsmith/cassandra,apache/cassandra,belliottsmith/cassandra,mshuler/cassandra,apache/cassandra,pauloricardomg/cassandra,instaclustr/cassandra,mshuler/cassandra,jrwest/cassandra,blambov/cassandra,mike-tr-adamson/cassandra,tjake/cassandra