fix VM detection, automated testing fixes, use newer chatmail-turn and move to standard BIND DNS zone format

[hpk42]

minimizes and supersedes #907 #884 which added "cmdeploy lxc-*" subcommands but also added a lot of code that we don't really want in the cmdeploy repository. Instead i am working on a new "cmlxc" command (work title) that lives in a separate repository. It will run tests inside a container which has access to local DNS resolution (the same PowerDNS setup as in the superseded PRs), so no dns-over-ssh resultion is needed anymore, further simplifying the PR.It now focuses on a few neccessary fixes and enhancements, that can be independently merged and are useful fixes and improvements by themselves, even without any lxc:

• fix: make "cmdeploy test --config ..." work, without requiring or implicitely falling back to a "chatmail.ini" in parent dirs

• refactor: unify DNS zone-file to standard BIND format

• feat: update chatmail-turn to support private addresses

• refactor: various deployer improvements (VM detection, mailboxes dir ensured to be there, proper unbound on ipv4)

• fix: properly terminate and wait on subprocesses on test teardown

For those concerned, LLM tooling was involved in pulling code out and refining some parts. All LOCs were manually reviewed and edited.

[j4n]

lgtm :)

[link2xt]

I don't fully understand what "make "cmdeploy test --config ..." work, without requiring or implicitely falling back to a "chatmail.ini" in parent dirs" means. Looks like --config was never required and the bug was that its value was not passed into pytest. That's also why this is only in the test subcommand.

[hpk42]

it was meant to say that a chatmail.ini (in parent dirs of a test) was required despite "cmdeploy test --config" specifying one.