Added show extra_specs for flavors, code for default flavor to load from...

... config file, code to boot instance using port speed and unit tests for all and servers

Change-Id: I951c6be5ed8604a958b4f4413ceac6415f1520fd
Yeah, I think we're on the same page.

For the service listing, the token driver is actually loaded in each __init__ function (https://github.com/softlayer/jumpgate/blob/master/jumpgate/identity/drivers/sl/tokens.py#L144), but it probably makes much more sense to do it in the `jumpgate/compute/drivers.sl/__init__.py` file. For identity, the line I linked above would appear here: https://github.com/softlayer/jumpgate/blob/master/jumpgate/identity/drivers/sl/__init__.py#L39 and the fully loaded object would be passed in (instead of the filename like exists right now)