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In additon to physical connections we should also report multi-hop logical connections (MDFI + XeLink) as have positive bandwidth. Use a modified BFS algorithm to try to find a path between fabric vertices that are not directly connected together because the KMD always try to use MDFI link first, then go to XeLink. Multi-hop connections are bi-directional but might not be symmetric, so for every pair of vertices A & B that are not directly connected, we need to try to find both `A -> B` and `B -> A`. Related-To: GSD-7126 Signed-off-by: Wenbin Lu <wenbin.lu@intel.com>