iscsiadm installed by some Fedora releases, like Fedora 27, loses DataDigest parameter unintelligibly. Change-Id: I6664146c6e0cb8933188b29166bedd087f4d38e1 Signed-off-by: Xiaodong Liu <xiaodong.liu@intel.com> Reviewed-on: https://review.gerrithub.io/396076 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>