unixsock plugin: Implement the "DeleteSocket" option.
Merge pull request #140 from txaj/unixsock-delete-opt

Unixsock delete option
tcpconn plugin: $localports and $remoteports can me left undef if $listening is not set
Merge pull request #144 from txaj/tcpconn-fix-142

tcpconn plugin: $localports and $remoteports can me left undef