systemd: Do not start zookeeper on installation

We donot want zookeeper to start at installtion.
policy-rc.d not working for systemd in ubuntu-1604.
Adding separate command.

Change-Id: I54b182b031227ccb877b9df841a32cbed6ffa9af
Closes-Bug: #1732406

playbooks/roles/zookeeper/tasks/install/Debian.yml

@@ -5,6 +5,10 @@
 - name: install policy-rc.d to selectively disable automated service start by apt
   copy: src=policy-rc.d dest=/usr/sbin/policy-rc.d mode=0755
 
+- name: disable auto start zookeeper service in case of systemd
+  shell: systemctl mask zookeeper
+  when: contrail_service_mgr == 'systemd'
+
 - name: Install zookeeper with apt
   include: apt.yml
   when: zookeeper_debian_apt_install

playbooks/roles/zookeeper/tasks/setup.yml

@@ -8,6 +8,11 @@
   include: configure.yml
   tags: [configure, zookeeper.configure]
 
+- name: Unmask zookeeper service now in case of systemd
+  shell: systemctl unmask zookeeper
+  when: contrail_service_mgr == 'systemd'
+  tags: [service, zookeeper.service]
+
 - name: Start zookeeper service
   service: name=zookeeper state=started enabled=yes
   tags: [service, zookeeper.service]