Test nbd rpc methods:
start_nbd_disk
get_nbd_disk
stop_nbd_disk
Verify nbd data read and write by dd and cmp.
Change-Id: Ie32639d11727893ceac7adce0119b9c2085e74e1
Signed-off-by: Xiaodong Liu <xiaodong.liu@intel.com>
Reviewed-on: https://review.gerrithub.io/391732
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
