prov/efa: Fix 0 byte send/read/write support#11890

a-szegel wants to merge 10 commits intoofiwg:mainofiwg/libfabric:mainfrom

a-szegel:handle-0-byte-operations-in-efa-direct-rebaseda-szegel/libfabric:handle-0-byte-operations-in-efa-direct-rebasedCopy head branch name to clipboard