Perf UI Bench Testing Code for vm infrastructure page

This code navigates to VMs/Templates and records page load times out of production.log.  When the appliance has rails debug turned on, it will record the number of select queries (cached/uncached).  

There are a few issues/assumptions with the code currently that I'd like to get worked out:
* Rails debug will work best on an appliance with only the UI role, as queries will become chatty in production.log and parsing production.log will consume large amounts of time.
* Appliance under test is pre-provisioned and loaded with a db or connected to a db appliance with data already on it.
* One MiqUIWorker on the appliance under test.

The output is logged to cfme.log and in a csv file to build charts from.  Ideally, charts can be generated of the most relevant ui pages to check using pygal or some other graph generating python module.  Pass/Fail criteria is checked per page load inside analyze_page_stat and logged as a warning.
`tolist` is somewhat unpythonic, and based on the redefinition of this class's attributes in the test function, I would suggest that a dict is what you want. To the end, the elegant solution would be to move the contents of the `header` identifier from your test as a attribute of this class (`headers`, for example), and ensure that the attributes of this class actually match the column names in that attribute.

Once that's done, use __iter__ instead of tolist, and return tuples of `(name, value)` pairs:
```python
def __iter__(self):
    for header in self.headers:
        yield header, getattr(self, header)
```

Then, in your test code, use [csv.DictWriter](https://docs.python.org/2/library/csv.html#csv.DictWriter) instead of csv.writer, instantiated using the headers from this class as DictWriter's `fieldnames` param. Write the headers with [writeheader](https://docs.python.org/2/library/csv.html#csv.DictWriter.writeheader) instead of manually, and write rows with `csvwriter.writerow(dict(pagestat_instance))`