Remove vflow rate measurement calls from the tcp and amqp adaptor

[ganeshmurthy]

Remove all calls to vflow_add_rate

adaptors/tcp/tcp_adaptor.c:    vflow_add_rate(li->common.vflow, VFLOW_ATTRIBUTE_FLOW_COUNT_L4, VFLOW_ATTRIBUTE_FLOW_RATE_L4);
adaptors/tcp/tcp_adaptor.c:    vflow_add_rate(connector->common.vflow, VFLOW_ATTRIBUTE_FLOW_COUNT_L4, VFLOW_ATTRIBUTE_FLOW_RATE_L4);
adaptors/tcp/tcp_adaptor.c:    vflow_add_rate(conn->common.vflow, VFLOW_ATTRIBUTE_OCTETS, VFLOW_ATTRIBUTE_OCTET_RATE);
adaptors/tcp/tcp_adaptor.c:    vflow_add_rate(conn->common.vflow, VFLOW_ATTRIBUTE_OCTETS_REVERSE, VFLOW_ATTRIBUTE_OCTET_RATE_REVERSE);
adaptors/amqp/connection_manager.c:            vflow_add_rate(ct->vflow_record, VFLOW_ATTRIBUTE_OCTETS, VFLOW_ATTRIBUTE_OCTET_RATE);
adaptors/amqp/connection_manager.c:            vflow_add_rate(ct->vflow_record, VFLOW_ATTRIBUTE_OCTETS_REVERSE, VFLOW_ATTRIBUTE_OCTET_RATE_REVERSE);