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roles

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    Bogdan Dobrelya authored
    In order to enable offline/intranet installation cases:
    * Move DNS/resolvconf configuration to preinstall role. Remove
      skip_dnsmasq_k8s var as not needed anymore.
    
    * Preconfigure DNS stack early, which may be the case when downloading
      artifacts from intranet repositories. Do not configure
      K8s DNS resolvers for hosts /etc/resolv.conf yet early (as they may be
      not existing).
    
    * Reconfigure K8s DNS resolvers for hosts only after kubedns/dnsmasq
      was set up and before K8s apps to be created.
    
    * Move docker install task to early stage as well and unbind it from the
      etcd role's specific install path. Fix external flannel dependency on
      docker role handlers. Also fix the docker restart handlers' steps
      ordering to match the expected sequence (the socket then the service).
    
    * Add default resolver fact, which is
      the cloud provider specific and remove hardcoded GCE resolver.
    
    * Reduce default ndots for hosts /etc/resolv.conf to 2. Multiple search
      domains combined with high ndots values lead to poor performance of
      DNS stack and make ansible workers to fail very often with the
      "Timeout (12s) waiting for privilege escalation prompt:" error.
    
    * Update docs.
    
    Signed-off-by: default avatarBogdan Dobrelya <bdobrelia@mirantis.com>
    a15d6267
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