CouchKVStore::getAllKeys does not log pretty error string / OS error on error response of couchstore_all_docs

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        errCode = couchstore_all_docs(db, &ref, COUCHSTORE_NO_DELETES,

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                                      populateAllKeys,

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                                      static_cast<void *>(&ctx));

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        closeDatabaseHandle(db);

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        if (errCode == COUCHSTORE_SUCCESS ||

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                errCode == COUCHSTORE_ERROR_CANCEL)  {

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            return ENGINE_SUCCESS;

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        } else {

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            logger.log(EXTENSION_LOG_WARNING, "couchstore_all_docs failed for "

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                       "database file of vbucket = %d rev = %" PRIu64 ", "

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                       "errCode = %u", vbid, rev, errCode);