test: fix ducktape test failures in clustered bare metal environment

[dotnwat]

When running ducktape tests against a bare metal clustered environment a large percentage of the tests pass out-of-the-box. Most tests that don't pass appear to be related to an interaction with the allowed_log feature in ducktape that asserts unknown errors do not appear in redpanda logs. Finally, there are a few tests that have real failures that may be related to being run in the clustered environment.

This ticket covers ensuring that all the tests pass.

[ajfabbri]

As discussed w/ Noah, I've been taking the time to add more automation around this case to eliminate the manual setup steps. Adding support for our ansible inventory files to ducktape here.

[ajfabbri]

Update: Automation took longer than expected but we learned a lot and made great progress. The clustered bug fixing was also time consuming, but we're wrapping it with a big team effort. 🙌

[ajfabbri]

Our set of successful tests between clustered and containerized DT runs is very similar now. Thanks everyone who helped.