An new RPC set_iscsi_discovery_auth enables users to configure
CHAP authentication for discovery sessions dynamically.
Try to use descriptive message in the RPC when error occurs.
Change-Id: I8883d5e054539cf6db091a5b79d0479e62119811
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.gerrithub.io/420976
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>