HAPServer doesn't close sockets and eventually hits OS limit

After running hap for several days my system hit the limit of listen sockets (128 default on raspbian). Most of them in CLOSE_WAIT, so hap-client sent FIN but hap-server code didn't handle it correctly (it suppose to close socket).
```
>netstat -an | egrep 51826.+CLOSE_WAIT | wc -l
122
```
Briefly looked into hap_server.py, can't see how is this situation handled