crc delete should delete /etc/resolver/testing

[AkihiroSuda]

On macOS, /etc/resolver/testing remains after crc testing. It would be great if crc delete can remove this file as well as the cluster.

[cfergeau]

If we remove after crc delete, this means you can't do crc start, you will need to run crc setup again, which will ask for sudo to recreate it, and then you can do crc start. We could make sure /etc/resolver/testing is empty though, similarly to what is requested in issue #296. And an crc unsetup command to undo everything which crc setup did would be useful too.

[gbraad]

We have a generic cleanup task here: #348 This needs some discussion, as it mostly macOS and Linux now that creates 'unwanted' artifacts when CRC is not used.

However, Docker for Desktop also leaves entries in hosts on Windows... not sure about other platforms. eg.:

# Added by Docker Desktop
10.0.21.112 host.docker.internal
10.0.21.112 gateway.docker.internal
# End of section

[cfergeau]

And another issue related to cleaning up what setup does: #507

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gbraad]

Duplicate of #651