Open Stack

So I've been playing with microversions and noticed that the information about
req.ver_obj.matches(start_version, end_version) in the spec doesn't actually 
match what's in the codebase.

1) The code has req.api_version_request instead of req.ver_obj

2) The spec says that "end_version is optional in which case it will match any
version greater than or equal to start_version."  The code requires both but 
allows either to be None.

If we're going to refer people to the spec, do we maybe want to update the spec 
to match the code?

Chris