add usnic provider
adds usnic provider, Makefile and configure updated to build usnic,
FI_PROTO_UDP added

Signed-off-by: Reese Faucette <rfaucett@cisco.com>
Merge pull request #193 from j-xiong/master

prov/psm: cq_read optimization, tag bit reservation rework, and a few bug fixes
Merge pull request #197 from rfaucett/usdf

add usnic provider