sstableloader: Use the connectionsPerHost parameter for driver pool
sstableloader: Use the connectionsPerHost parameter for driver pool

Message-Id: <8ff175092051eaae6b97e786adc8bf21a4f92612@scylladb.com>

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