temporary switch chunk job to "docker" label

Change-Id: Iabac560239f0f69e6db22738b82e0b45c3e94c85
diff --git a/test-cookiecutter-reclass-chunk.groovy b/test-cookiecutter-reclass-chunk.groovy
index 8caca44..15634bd 100644
--- a/test-cookiecutter-reclass-chunk.groovy
+++ b/test-cookiecutter-reclass-chunk.groovy
@@ -9,7 +9,7 @@
  *  SLAVE_NODE:
  */
 
-slaveNode = env.SLAVE_NODE ?: 'virtual'
+slaveNode = env.SLAVE_NODE ?: 'docker'
 
 timeout(time: 1, unit: 'HOURS') {
     node(slaveNode) {