If user calls rpc.py with no parameters, it currently
hangs, waiting for input. It should print help in this
case instead.
Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I5939999c57b8db0916267935d79ccc1a3201748b
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/453431
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>