Control port command syntax bug in get_hidden_service_descriptor()

The get_hidden_service_descriptor function takes an onion address and a list of hidden service descriptors to fetch the hidden service descriptor from.

There is a bug in the controller.get_hidden_service_descriptor(). There is a space missing between the onion address and the first SERVER= argument when a HSDir is specified manually.

I have pushed a patch to Github - https://github.com/DonnchaC/stem/pull/2

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