Fixed "ERROR: Step ‘Publish JUnit test result report’ failed: No test report files were found. Configuration error?" on Jenkins because report files were put in tests/postgres_tests. Backport of 2de7eb6f4d5a20cec98e4d2eefc276ee38d149ad from master.
Regression in e192223ed996ed30fe83787efdfa7f2be6b1a2ee. Backport of 2804b8d2153505ec49b191db2168302dfb92c3af from master.