storage_service: Add more error info to "isolate_on_error" shutdown
storage_service: Add more error info to "isolate_on_error" shutdown

Fixes #2793

Prints error handle class (commitlog or "other/disk") + exception
type and message. While not exhaustive, at least gives a correlation
point to (hopefully) other log printouts.

Message-Id: <4000830a7fcc84d8cd3966ee295af7dd14a4f6c8@scylladb.com>

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