sstableloader: Use correct value for keyspace strategy name
sstableloader: Use correct value for keyspace strategy name

Also fix imports
Message-Id: <dc329334d9e747d048b24954d6f4335e2ba98687@scylladb.com>

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