ud_pingpong fixes
1) properly initialize av_attr
2) send local addr from client to server for east AV insert

Signed-off-by: Reese Faucette <rfaucett@cisco.com>
Merge pull request #90 from rfaucett/pr/ud_pp

ud_pingpong fixes
Cleaned up multiple segments and simplified multi_recv logic
Merge remote branch 'upstream/master' into multi_recv