Update Jenkinsfile to align node names with https://gerrit.opencord.org/c/15712/

Change-Id: I65b8d51b35b497248c6e99bfc8a43c166cbc1b6c
diff --git a/tests/bbr.groovy b/tests/bbr.groovy
index dd558f2..974b752 100644
--- a/tests/bbr.groovy
+++ b/tests/bbr.groovy
@@ -18,7 +18,7 @@
 
   /* no label, executor is determined by JJB */
   agent {
-    label "${params.executorNode}"
+    label "${params.buildNode}"
   }
 
   stages {