Allow auth on jenkins, split slave system

Change-Id: I35416dcd6baaa0159f2191be9b4029228545aa53
diff --git a/jenkins/slave/docker.yml b/jenkins/slave/docker.yml
new file mode 100644
index 0000000..b134225
--- /dev/null
+++ b/jenkins/slave/docker.yml
@@ -0,0 +1,9 @@
+classes:
+  - system.jenkins.slave
+parameters:
+  linux:
+    system:
+      user:
+        jenkins:
+          groups:
+            - docker