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
This could be a path to a json document with this same information. That way, you can actually format the JSON to be somewhat readable. There's an example of this (although not with JSON) in the sl identity driver.