Fix pcl-zqv.5.7: eliminate deadlock in pfs_get_both_locks (#339)
* Fix pcl-zqv.5.7: eliminate deadlock in pfs_get_both_locks
- Enforce consistent lock ordering: always acquire psql lock before file mutex
- Remove retry loop that could spin indefinitely
- Replace abort() with error return in pfs_lock_file timeout
- Add unit test verifying lock ordering prevents deadlock
Fixes GH #258
* Reorganize tests: smoke-tests, fault-inject, unit-tests
* Reorganize tests: smoke-tests, fault-inject, unit-tests
* Remove validation report
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Co-authored-by: Levi Neely <lkn@darkstar.example.net>
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