Separate `tmt run -i` options for host/guest

[comps]

Currently, the -i / --id option specifies either a directory name inside /var/tmp/tmt, or (if starting with /) a path to a directory anywhere else.

The problem is that this is both a path on the host and the on the guest.

I would like to run tmt run on the host and tell it to output YAML results (along with test logs) onto a deterministic location, preferably in an existing temporary directory (ie. /tmp/my_orchestrator_tool/tmt), so I can

• read /tmp/my_orchestrator_tool/tmt/run.yaml to figure out the plan path
• read /tmp/my_orchestrator_tool/tmt/plans/$plan_path/execute/results.yaml and evaluate the results

All that without changing the /var/tmp/tmt/* path on the guest - I don't care where the test is stored on the guest, but it should probably not be in /tmp which is lost across reboots.