i#6635 core filter, part 7: Improve init-idle subclass support #6707
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Improves record_filter_t subclass support for initially-idle cores by refactoring get_output_basename() out of initialize_shard_output(), allowing a subclass to share the complex initial setup while still using its own output scheme. Also moves the setup variable to protected for access to output_ext_ in subclasses.
Removes code that was refactored into initialize_shard_output() but accidentally left in place in PR #6704.
Tested internally.
Issue: #6635