Fix flaky test

[oysteintveit-nordicsemi]

Seems like the subtype test has become flaky, after I accidentally named the service equally for the hostname resolution test from #192. This PR fixes that, as well as adding some dependencies for capturing output logs made by the log macros.

[oysteintveit-nordicsemi]

Seems like the MSRV of env_logger version 0.11.3 is 1.71. Should I remove the extra test dependencies in favor of keeping this project's MSRV to 1.63.0?

[keepsimple1]

Thanks for fixing the test! Minor comments inline.

[keepsimple1]

First time seeing this crate. Seems neat based on its doc. Is it working well for you?

Since it's for test code only, could we also use its lower version to avoid bumping up MSRV to 1.71?

[oysteintveit-nordicsemi]

This one was tricky to downgrade for some reason. Cargo kept insisting that we use version 0.2.15 of transitive dependency test-log-macros, despite test-log 0.2.14 depending on version test-log-macros 0.2.14 itself. I've included test-log-macros as a dev dependency just to trick cargo to use the right one, but we never use that dependency directly.

I have not used this crate before myself, but I've found myself adding env_logger::init() to the start of every single test I write. I'll probably start using it from now on.

[keepsimple1]

LGTM! Thanks!