message: Fix postgres_options_test
diff: @@ -18,6 +18,7 @@ static const logger::LoggerPtr test_log =
  getTestLoggerManager()->getChild("PostgresOptions")->getLogger();
  static const std::string default_working_dbname{"working_dbname"};
  +static const std::string default_maintenance_dbname{"postgres"};
  /**
  * Check that the given connection string contains field=value entry.
  @@ -120,9 +121,8 @@ TEST(PostgresOptionsTest, DBnameParamExist) {
  "1991",
  "petya",
  "friend",
  - dbname, // TODO 2019.06.26 mboldyrev IR-556 change dbname
  - // to default_working_dbname
  - "petya");
  + dbname,
  + default_maintenance_dbname);
  }
  /**
  @@ -140,7 +140,7 @@ TEST(PostgresOptionsTest, DBnameParamNotExist) {
  PostgresOptions(pg_opt_string, default_working_dbname, test_log);
  checkPgOpts(
  - pg_opt, "down", "1991", "crab", "friend", default_working_dbname, "crab");
  + pg_opt, "down", "1991", "crab", "friend", default_working_dbname, default_maintenance_dbname);
  }
  /**
  