uvp: obtain desired interface by GUID

uvp: obtain desired interface by GUID

The current uvp_get_interface() routine takes a structure as input.
Included in the structure is a version number.

A better solution to supporting multiple interfaces is to define
interfaces using GUIDs.  This not only allows different versions of
the same interface (for example the UVP interface), but also provides
a mechanism that can be used to add new interfaces without affecting
existing ABIs or APIs.

This will make it easier to extend the existing interfaces in the future.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1@1438 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86