upnp: only delete mappings that match our port

else neighboring LAN clients delete each other's mappings

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>
pip breaks after upgrading python package requests
Update and rename 01 Ricardian-Contracts.md to 01 Ricardian Contracts.md
Merge pull request #563 from y12studio/requests-pip-break

pip break in Docker Ubuntu 14.04  build
Merge pull request #562 from benemorius/upnp

upnp: only delete mappings that match our port