Fix jenkins docker image name

Change-Id: I8b8673014cca53b4c002d4e3dedee97036f74c11
diff --git a/jenkins-docker/master/Dockerfile b/jenkins-docker/master/Dockerfile
index 9563800..7e4f9e2 100644
--- a/jenkins-docker/master/Dockerfile
+++ b/jenkins-docker/master/Dockerfile
@@ -1,4 +1,4 @@
-FROM jenkins:latest
+FROM jenkins/jenkins
 
 USER root