Added TABLE_LOOKUP_IF_NW_TO_DP_NW.
Changed the name of Manager::item to retrive and added an alias.
Check the interface is valid when loading network services.
Redid how filters are built for interface manager.
Properly set the source ip address for tunnels since it seems egress interface isn't possible to select.
Merge remote branch 'origin/master' into feature-lookup-if-nw
Merge pull request #165 from axsh/fix-tunnel-local-ip

Fix tunnel local ip