qperf XRC tests output "bad test"

[bsmith94]

qperf --help tests documents XRC tests, but reports "bad test" when those tests are chosen for execution.

# qperf --help tests| grep xrc
    xrc_bi_bw               XRC streaming two way bandwidth
    xrc_bw                  XRC streaming one way bandwidth
    xrc_lat                 XRC one way latency
# qperf host1 xrc_bw
xrc_bw: bad test; try: qperf --help tests
# qperf host1 xrc_lat
xrc_lat: bad test; try: qperf --help tests
# qperf host1 xrc_bw_bw
xrc_bw_bw: bad test; try: qperf --help tests

[bsmith94]

This is partly because of the XRC problems documented in issue #3. The man page indicates that XRC tests may not be available, but the help message leaves this as a mystery for the user.