cinder-storpool-tempest: Disable volume multiattach

Change-Id: I7d1b92ac082186ccc0babe48e3343e32c193dcd5
diff --git a/zuul.d/sp-cinder.yaml b/zuul.d/sp-cinder.yaml
index b8ff101..52e896e 100644
--- a/zuul.d/sp-cinder.yaml
+++ b/zuul.d/sp-cinder.yaml
@@ -129,7 +129,7 @@
         USE_PYTHON3: True
         # cfg: block
         TEMPEST_STORAGE_PROTOCOL: storpool
-        ENABLE_VOLUME_MULTIATTACH: true
+        ENABLE_VOLUME_MULTIATTACH: false
       devstack_local_conf:
         test-config:
           $TEMPEST_CONFIG: