[JUnit5] Oracle ETE tests flup

[barisoyoruk]

My leftover work from junit5 project.

[barisoyoruk]

My findings:

• If we run DbKvsOracleSerializableTransactionTest before OracleNamespaceDeleterIntegrationTest, we get the exception message Truncate called on a table (a_ns__atlasdb_transactions_test_table) that did not exist when running the test methods of OracleNamespaceDeleterIntegrationTest.
• If we let them run in parallel, the tests fail.
• If we run DbKvsOracleSerializableTransactionTest first, the tests fail.
• If we run OracleNamespaceDeleterIntegrationTest first, the tests succeed.

The weird thing is that we create the test table just before truncating. If the create succeeds, then I don't understand why truncate fails with saying that there is no such table.

Some trivia:

• OracleNamespaceDeleterIntegrationTest actually never uses TEST_TABLE
• If we wrap truncate method with try/catch, the tests succeeds

[barisoyoruk]

I found the problematic class is OracleAlterTableIntegrationTest and function

    @AfterEach
    public void after() {
        defaultKvs.dropTables(defaultKvs.getAllTableNames());
        defaultKvs.dropTable(DbKvsOracleExtension.getKvsConfig().ddl().metadataTable());
        connectionSupplier.close();
    }

Since it is dropping metadata table, the following tests fail to find short name mapping for the test table. I added Order(Integer.MAX) value to this class but it is still running before other tests. I am not sure if it is Junit5 issue or I am missing something. I will deal with this PR in the future.