[AETHER-852] - Mask the service to enusre Jenkins will load the latest config.

- Only generate the init groovy script for first-time installation
- Remove init groovy script after first-time instllation.
- Moved the variable location

Change-Id: I0c0fb01f21353c817e2de986c86903df0387b9e4
diff --git a/handlers/main.yml b/handlers/main.yml
index f9c19a7..17944b8 100644
--- a/handlers/main.yml
+++ b/handlers/main.yml
@@ -4,6 +4,16 @@
 # SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
 # SPDX-License-Identifier: Apache-2.0
 
+- name: unmask-jenkins
+  systemd:
+    name: "{{ jenkins_service }}"
+    masked: false
+
+- name: enable-jenkins
+  systemd:
+    name: "{{ jenkins_service }}"
+    enabled: true
+
 - name: start-jenkins
   systemd:
     name: jenkins