[IPoIB] Avoid the SM (3/4)

[IPoIB] Avoid the SM (3/4)

This patch changes the NetworkDirect CM proxy to take a path as input for the REQ IOCTL rather than a GID pair.  The IOCTL handler checks if the DLID in the path is zero and if so performs a path query using the SGID and DGID from the path (same code path as it used to take when the IOCTL provided a GID pair.)

Signed-off-by: Fab Tillier <ftillier@microsoft.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1@1612 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86