Run the iSCSI job with the correct storage protocol

Change-Id: Ic3d63dfcc7c8d43215248e2ff0020bafa4312383
diff --git a/zuul.d/sp-cinder.yaml b/zuul.d/sp-cinder.yaml
index 986a18d..720a7db 100644
--- a/zuul.d/sp-cinder.yaml
+++ b/zuul.d/sp-cinder.yaml
@@ -27,7 +27,7 @@
         # cfg: block
         # TEMPEST_STORAGE_PROTOCOL: storpool
         # cfg: iscsi
-        TEMPEST_STORAGE_PROTOCOL: storpool
+        TEMPEST_STORAGE_PROTOCOL: iscsi
         USE_PYTHON3: True
         # PYTHON3_VERSION: 3.6
       devstack_local_conf: