spdkcli: use items instead of iteritems for iSCSI connections

Without this, spdkcli crashes when refreshing if any iSCSI
connections are established.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I82cd7a98e8c7d48e4730a7bd228ed483bdac28ef

Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/451060
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

scripts/spdkcli/ui_node_iscsi.py

@@ -497,7 +497,7 @@ class UIISCSIConnection(UINode):
 
     def refresh(self):
         self._children = set([])
-        for key, val in self.ic.iteritems():
+        for key, val in self.ic.items():
             if key == "id":
                 continue
             UIISCSIConnectionDetails("%s: %s" % (key, val), self)