cinder-storpool-tempest-iscsi-multipath: Enable volume multiattach

Change-Id: I3fa9ac39e8c49dfe5b41b6e1a3c7a8f3139d2a04
diff --git a/zuul.d/sp-cinder.yaml b/zuul.d/sp-cinder.yaml
index 7119f3d..b8ff101 100644
--- a/zuul.d/sp-cinder.yaml
+++ b/zuul.d/sp-cinder.yaml
@@ -293,7 +293,6 @@
       devstack_localrc:
         # cfg: iscsi
         TEMPEST_STORAGE_PROTOCOL: iscsi
-        ENABLE_VOLUME_MULTIATTACH: false
       devstack_local_conf:
         post-config:
           $CINDER_CONF: