'kargo_deploy.sh' is not idempotent

Summary: ansible tasks [dnsmasq : check resolvconf] and [postinstall : Wait for kubedns to be ready] cause changes on every run of kargo_deploy.sh

Steps to reproduce:
- Prepare provisioned environment with 5 nodes
- Clone mcpinstaller repo from https://github.com/openstack/fuel-ccp-installer
- Export IPs of provisioned nodes. Example for nodes provisioned by fuel-devops:
    export ADMIN_IP="10.10.0.2"
    export SLAVE_IPS="10.10.0.2 10.10.0.3 10.10.0.4 10.10.0.5"
- Execute installer script:
    bash -x "utils/jenkins/kargo_deploy.sh"
- Execute installer script second time:
    bash -x "utils/jenkins/kargo_deploy.sh"

Expected result: no changes made by ansible playbooks, example:
    PLAY RECAP *********************************************************************
    node1 : ok=5 changed=0 unreachable=0 failed=0
    node2 : ok=5 changed=0 unreachable=0 failed=0
    node3 : ok=5 changed=0 unreachable=0 failed=0
    ...

Actual result: [dnsmasq : check resolvconf] and [postinstall : Wait for kubedns to be ready] tasks made changes, see for details: http://paste.openstack.org/show/565101/