fix: test errors (#683)

Artyom Kartasovrequested to merge
683-linter-hot-fix into master
  1. Removed the duplicate TestWalDir_boundaryVersions test (there was already a correct TestWalDir)
  2. Removed the pg 9.6 uses pg_xlogdump test case from TestWalCommand_outputFormat since walCommand now always uses pg_waldump

Fixes #683 (closed)

Edited by Artyom Kartasov

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