add option to rerun validation if dns lookup hangs

[michaelamattes]

sometimes the dns challenge hangs due timeouts
DNS problem: SERVFAIL looking up TXT for _acme-challenge.bloxxter.in - the domain''s nameservers may be malfunctioning"

a rerun of the playbook recovers from the problem
this is a problem if the playbook runs in a pipeline, a manual interaction is needed every time

So we need an option to check if the validation succeeded, if not the check should be run a second time bevor the state becomes invalid.

[rndmh3ro]

This should be doable with register and until, something like this:

- name: Let the challenge be validated and retrieve the cert and intermediate certificate
  acme_certificate:
    account_key_src: "{{ acme_account_key_path }}"
    account_email: "{{ acme_account_email }}"
    csr: "{{ acme_csr_path }}"
    cert: "{{ acme_cert_path }}"
    fullchain: "{{ acme_fullchain_path }}"
    chain: "{{ acme_intermediate_path }}"
    challenge: dns-01
    force: "{{ acme_force_renewal | default(false) }}"
    acme_directory: "{{ acme_directory }}"
    acme_version: 2
    terms_agreed: true
    remaining_days: "{{ acme_remaining_days }}"
    data: "{{ challenge }}"
  register: validation
  until: validation.succeeded
  retries: 5
  delay: 10

I like this idea. We should then configure all validation-tasks like this.

[avalor1]

I thought about a rescue but until would be the better solution.