ipahost: Fix documentation sections and agument spec

ansible-test with ansible-2.14 is adding a lot of new tests to ensure
that the documentation section and the agument spec is complete. Needed
changes:

DOCUMENTATION section

- `type: str` needs to be set for string parameters
- `type: list` needs to be set for list parameters
- `elements: str` needs to be given for list of string parameters
- `suboptions` instead of `options` needs to be used for dict parameters
- `required` tags need to be fixed according to the `argument_spec`
- `aliases` tag needs to match `argument_spec`
- `type` tag needs to match `argument_spec`
- `default` tag needs to match `argument_spec`
- `author` needs to be given with the github user also: `Name (@user)`

RETURN section

- `contains` needs to be used instead of `options` for dicts
- `type: str` needs to be used for string parameters

argument_spec

- `elements="str"` needs to be added to all list of string parameters
- `no_log=False` or `no_log=True` needs to be set for all parameters
  that have `key` in the name or for dicts also in one the key names

The `copyright` date is extended with `-2022`.

Additional changes:

- Parameter sshpubkey changed to list of strings in argument_spec
- New test test/host/test_host_sshpubkey.yml