private void commitCreate(String path, CachingCurator database) {
        NestedTransaction t = new NestedTransaction();
        CuratorTransaction c = database.newCuratorTransactionIn(t);
        c.add(CuratorOperations.create(path));
        t.commit();
    }
Tests the curator db directly.
This verifies the details of the current implementation of the database, not just its API;
breaking this does not necessarily mean that a change is wrong.

@author bratseth
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/persistence/CachingCuratorTest.java