Update Jenkinsfiles to use buildNode instead of TestNodeName

Change-Id: Ifd68d1f67d88ebf7190e733311bfc8f8f1a59a06
diff --git a/Jenkinsfile-mcord-release-build b/Jenkinsfile-mcord-release-build
index f6aa928..70336fa 100644
--- a/Jenkinsfile-mcord-release-build
+++ b/Jenkinsfile-mcord-release-build
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-node ("${TestNodeName}") {
+node ("${buildNode}") {
   timeout (100) {
     try {
       stage ("Parse deployment configuration files") {