QA output created by 517
Usage cases ...
Usage: _clean_configs [-v] new_dir old_dir ...
Usage: _clean_configs [-v] new_dir old_dir ...
Usage: _clean_configs [-v] new_dir old_dir ...

No dirs exist
+ mkdir -p /TMP.new

Empty new dir, harvest all, no name matches
+ cp -p /TMP.old1/bar /TMP.new/bar
+ cp -p /TMP.old1/foo /TMP.new/foo
+ cp -p /TMP.old2/fumble /TMP.new/fumble
+ cp -p /TMP.old2/mumble /TMP.new/mumble
+ cp -p /TMP.old2/stumble /TMP.new/stumble
bar: bar
foo: foo
fumble: fumble
mumble: mumble
stumble: stumble

All names match, some older files
+ cp -p /TMP.old2/mumble /TMP.new/mumble
bar: newer bar
foo: foo
fumble: fumble
mumble: newer mumble
stumble: stumble

Hybid cases
+ cp -p /TMP.old1/foo /TMP.new/foo
+ cp -p /TMP.old2/foo /TMP.new/foo
+ cp -p /TMP.old2/fumble /TMP.new/fumble
bar: newer bar
foo: foo
fumble: fumble
mumble: newer mumble
stumble: stumble