Introduce `defer_verbose_shutdown` in `cql_test_env` which logs
a message before and after shutting down a service, distinguishing
between success and failure.
The function is similar to the one in `main` but skips special error
handling logic applicable only to the main Scylla binary. The purpose
of the `cql_test_env` version of this function is only more verbose
logging. If necessary it can be extended in the future with additional
logic.
I estimated the impact on the size of produced log files using
`cdc_test` as an example:
```
$ build/dev/test/boost/combined_tests --run_test=cdc_test -- --smp=2 \
>logfile 2>&1
$ du -b logfile
```
the result before this commit: 1964064 bytes, after: 2196432 bytes,
so estimated ~12% increase of log file size for boost tests that use
`cql_test_env`, assuming that the number of logs printed by each test is
similar to the logs printed by `cdc_test` (but I believe `cdc_test` is
one of the less verbose tests so this is an overestimate).
The motivation for this change is easier debugging of shutdown issues.
When investigating scylladb/scylladb#21983, where an exception is
thrown somewhere during the shutdown procedure, I found it hard to
pinpoint the service from which the exception originates. This change
will make it easier to debug issues like that by wrapping shutdown of
each service in a pair of messages logged when shutdown starts and when
it finishes (including when it fails). We should get more details on
this issue when it reproduces again in CI after this commit is merged
into `master`. (I failed to reproduce it locally with 1000 runs.)
Ref scylladb/scylladb#21983Closesscylladb/scylladb#22566
febd45861e