uvp/get_interface: add new interface to get versioned uvp functions

uvp/get_interface: add new interface to get versioned uvp functions

Add a new call, uvp_get_interface_n(version, p_interface, sizeof(*p_interface)) that users can call to retrieve a specific interface that is supported by a uvp.  With the introduction of NDI and WinVerbs support, the uvp_interface structure changes.  Support for interface versioning will allow future changes to UVPs independent of IBAL and WinVerb changes and from each other.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1@996 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86