Use the correct node label for the test job

Change-Id: Ic9277739abddb512319580a25b5a4c81891daf57
diff --git a/zuul.d/sp-cinder.yaml b/zuul.d/sp-cinder.yaml
index 296b11b..5cc1b3c 100644
--- a/zuul.d/sp-cinder.yaml
+++ b/zuul.d/sp-cinder.yaml
@@ -6,6 +6,10 @@
     required-projects:
       - config
     timeout: 3600
+    nodeset:
+      nodes:
+        - name: tempest
+          label: centos-base
 
 - project:
     name: config