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## Overview
<!-- Please give a short brief for the pull request,
what problem it solves or how it makes things better. -->
Fix make warnings from cpse_test_purge_seqs.erl file
```
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:19:
Warning: function setup_each/0 is unused
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:24:
Warning: function teardown_each/1 is unused
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:28:
Warning: function cpse_increment_purge_seq_on_complete_purge/1 is unused
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:69:
Warning: function cpse_increment_purge_multiple_times/1 is unused
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:98:
Warning: function cpse_increment_purge_seq_on_partial_purge/1 is unused
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:102:
Warning: variable 'Rev2' is unused
```
## Testing recommendations
<!-- Describe how we can test your changes.
Does it provides any behaviour that the end users
could notice? -->
Only the warning below exists after this PR.
```
/Users/jiangph/couchdb/src/couch_pse_tests/src/cpse_test_purge_seqs.erl:14:
Warning: export_all flag enabled - all functions will be exported
```
## Related Issues or Pull Requests
<!-- If your changes affects multiple components in different
repositories please put links to those issues or pull requests here. -->
https://github.com/apache/couchdb/issues/1573
## Checklist
- [X] Code is written and works correctly;
- [X] Changes are covered by tests;
- [ ] Documentation reflects the changes;
[ Full content available at: https://github.com/apache/couchdb/pull/1576 ]
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