added simple kvs benchmark
added simple kvs benchmark

arthurprs/aerospike-client-python,trupty/aerospike-client-python,aerospike/aerospike-client-python,arthurprs/aerospike-client-python,aerospike/aerospike-client-python,arthurprs/aerospike-client-python,trupty/aerospike-client-python,trupty/aerospike-client-python,aerospike/aerospike-client-python