Calling result() on a list of futures

[ogrubes]

If you declare a list of futures, and then later call result() on each future, swaggerpy will return a list of identical values corresponding to the last future created.

ex:
myfutures = [swaggerclient.myendpoint for elem in elem_list]
myresults = [future.result() for future in myfutures]

myresults will return a list of identical values, all equal to myfutures[-1].result()

[dnephin]

I believe this is caused by: https://github.com/Yelp/swagger-py/blob/master/swaggerpy/response.py#L42

setup() should not be part of the HttpClient api, the clients are shared, and they shouldn't be treated as immutable.

The request params should get stored on the HTTPFuture instead I think.

[dnephin]

There are actually a bunch of methods that mutate state on the HTTPClient object, I think a bunch of those are going to need to change, and be moved onto a Request object.