Correct bugs during bootstrap

1. Ensure Zookeeper restarts and checks out successfully before
proceeding with other steps.
2. Make sure PVC itself doesn't start prematurely.

roles/pvc/tasks/zookeeper/bootstrap.yml

@@ -0,0 +1,13 @@
+---
+- name: restart Zookeeper on all nodes
+  service:
+    name: zookeeper
+    state: restarted
+
+- name: wait 10s for cluster to stabilize
+  pause:
+    seconds: 10
+
+- name: ensure Zookeeper is running on node1
+  shell: echo "ls /" | /usr/share/zookeeper/bin/zkCli.sh
+  when: ansible_local.host_id == 1