Fix for runbenchmark command to run without agrument
Fix for runbenchmark command to run without agrument

wgpshashank/aerospike-client-java,alexandrnikitin/aerospike-client-java,wgpshashank/aerospike-client-java,pradeepsrinivasan/aerospike-client-java,alexandrnikitin/aerospike-client-java,pradeepsrinivasan/aerospike-client-java