Remove temporary dir after apt key import

[wisnij]

Remove the temporary directory created by _apt_key_import.yml after
importing the key, so they don't pile up in the hosts' /tmp dirs.

[wisnij]

Tested locally on a host using this role:

TASK [datadog.datadog : Create temporary directory for key manipulation] *******
ok: [localhost]

TASK [datadog.datadog : Download https://s3.amazonaws.com/public-signing-keys/DATADOG_APT_KEY_CURRENT.public to import key DATADOG_APT_KEY_CURRENT] ***
ok: [localhost]

TASK [datadog.datadog : Ensure downloaded file for DATADOG_APT_KEY_CURRENT is a binary keyring] ***
ok: [localhost]

TASK [datadog.datadog : Extract the required key from the binary keyring (when not DATADOG_APT_KEY_CURRENT)] ***
skipping: [localhost]

TASK [datadog.datadog : Extract the required key from the binary keyring (when DATADOG_APT_KEY_CURRENT)] ***
ok: [localhost]

TASK [datadog.datadog : Import key DATADOG_APT_KEY_CURRENT to /usr/share/keyrings/datadog-archive-keyring.gpg keyring] ***
ok: [localhost]

TASK [datadog.datadog : Remove temporary directory for key manipulation] *******
ok: [localhost]

[bkabrda]

Nice catch. Thanks for the PR, I'm merging.

[briantist]

Thanks @bkabrda ! When do you expect the next release which will include this change?

[bkabrda]

@briantist I've just released version 4.16.0 which includes this change.