Wait for handler for every item in with_lines - Ansible

Question

Ansible Version: ansible 2.4.2.0

I want to start VM sequentially depends on the role(master/backup). Multiple VM IDs are stored in 2 files master & backup. The controller flow should like below

1. Iterate VM IDs one by one from a file
   • For every iteration, the handler should notified. i.e the iteration should WAIT for handler complete
   • Iteration should not move foreword if handler is failed(or in WAITING state).

For reference, you see the below playbook

- name: Performs Power Actions VMs
  hosts: localhost
  vars:
    - status: "{% if action=='stop' %}SHUTOFF{% else %}ACTIVE{% endif %}"   # For Checking VM status

  tasks:
  - name: Staring Master VM
    shell: |
      echo {{ item }} > /tmp/current
      echo "RUN nova start {{ item }} HERE!!!"
    when: action == "start"
    with_lines: cat ./master
    notify: "Poll VM power status"

  - name: Starting Backup VM
    shell: |
      echo {{ item }} > /tmp/current
      echo "RUN nova start {{ item }} HERE!!!"
    when: action == "start"
    with_lines: cat ./backup
    notify: "Poll VM power status"
 
  handlers:
  - name: Poll VM power status
    shell: openstack server show -c status --format value `cat /tmp/current`
    register: cmd_out
    until: cmd_out.stdout == status
    retries: 5
    delay: 10

For above playbook, what I see is the handlers is notified after entire iteration is complete.

PLAY [Performs Power Actions on ESC VMs] **********************************************************************************************

TASK [Stopping Backup VM] *********************************************************************************************************
skipping: [localhost] => (item=Test) 

TASK [Stopping Master VM] *********************************************************************************************************
skipping: [localhost] => (item=Test) 

TASK [Staring Master VM] **********************************************************************************************************
changed: [localhost] => (item=Test)

TASK [Starting Backup VM] *********************************************************************************************************
changed: [localhost] => (item=Test)

TASK [Removing tmp files] *************************************************************************************************************
changed: [localhost] => (item=./master)
changed: [localhost] => (item=./backup)

RUNNING HANDLER [Poll VM power status] ********************************************************************************************
FAILED - RETRYING: Poll ESC VM power status (5 retries left).
^C [ERROR]: User interrupted execution

Is there any better approach to solve this problem? or Any suggestion how to fit block in this playbook to solve?

PS: The dummy command in tasks RUN nova start {{ item }} HERE!!! doesn't wait. That's why I have to check the status manually.