Stop cc_ssh_authkey_fingerprints from ALWAYS creating home (#1343)

cloudinit/config/cc_ssh_authkey_fingerprints.py unintentionally ends
up creating a home directory for a user even when `no_create_home:
true` or `system: true`. This prevents it.

`cc_ssh_authkey_fingerprints.py` calls `ssh_util.extract_authorized_keys`,
which ends up calling `check_create_path`, which creates the as yet
non-existent home while looking for an `authorized_keys` file to parse.
`cc_ssh_authkey_fingerprints.py` looks like the best place to stop this.

NOTE that I do not handle the situation where (`no_create_home: true`
or `system: true`) *and* yet `ssh_authorized_keys` is provided. In
this case, by virtue of the code `no_create_home: true` / `system:
true` takes precedence

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