Ansible >= 4 (ansible-core >= 2.11) the SSH plugin has a `timeout` option and
with variable `ansible_ssh_timeout`, but not a `ansible_timeout` variable.
The local plugin has no such option or variable(s). However `ansible_timeout`
is backfilled for all conection plugins, by legacy mechanisms that populate
the play context attribute:
- `ansible.constants.COMMON_CONNECTION_VARS`
- `ansible.constants.MAGIC_VARIABLE_MAPPING`
The `timeout` keyword is for task completion timeout, not connection timeout.
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