When starting the `rrul46compete` test, I noticed some weird behavior:

With defined hosts `mn.h1` and `mn.h2`, each having an IPv4 as well as an IPv6 address, the command
`sudo flent rrul46compete -p all_scaled -l 60 -H mn.h2 -o rrul46_nolocal.pdf -v`
runs error free with complete graph output.

However, specifying a `--local-bind`, the TCP connections for IPv4 fail at some point and their respective lines in the graph are missing:
Changed command:
`sudo flent rrul46compete -p all_scaled --local-bind mn.h1 -l 60 -H mn.h2 -o rrul46_new.pdf -v`

Error output (same for upload BK, download BE and download BK respectively):
```
WARNING: Program exited non-zero.
Runner class: NetperfDemoRunner
Command: /usr/bin/netperf -P 0 -v 0 -D -0.20 -4 -Y 0x0,0x0 -H mn.h2 -p 12865 -t TCP_STREAM -l 60 -F /dev/urandom -f m -L mn.h1  --   -L mn.h1 -H mn.h2 -k THROUGHPUT,LOCAL_CONG_CONTROL,REMOTE_CONG_CONTROL,TRANSPORT_MSS,LOCAL_TRANSPORT_RETRANS,REMOTE_TRANSPORT_RETRANS,LOCAL_SOCKET_TOS,REMOTE_SOCKET_TOS,DIRECTION,ELAPSED_TIME,PROTOCOL,LOCAL_SEND_SIZE,LOCAL_RECV_SIZE,REMOTE_SEND_SIZE,REMOTE_RECV_SIZE,LOCAL_BYTES_SENT,LOCAL_BYTES_RECVD,REMOTE_BYTES_SENT,REMOTE_BYTES_RECVD  
Return code: 1
Stdout: get_sockaddr_family_addr_port family mismatch 10 vs 2

Stderr: netperf: send_omni: connect_data_socket failed: Invalid argument

WARNING: Command produced no valid data.
Runner class: NetperfDemoRunner
Command: /usr/bin/netperf -P 0 -v 0 -D -0.20 -4 -Y 0x0,0x0 -H mn.h2 -p 12865 -t TCP_STREAM -l 60 -F /dev/urandom -f m -L mn.h1  --   -L mn.h1 -H mn.h2 -k THROUGHPUT,LOCAL_CONG_CONTROL,REMOTE_CONG_CONTROL,TRANSPORT_MSS,LOCAL_TRANSPORT_RETRANS,REMOTE_TRANSPORT_RETRANS,LOCAL_SOCKET_TOS,REMOTE_SOCKET_TOS,DIRECTION,ELAPSED_TIME,PROTOCOL,LOCAL_SEND_SIZE,LOCAL_RECV_SIZE,REMOTE_SEND_SIZE,REMOTE_RECV_SIZE,LOCAL_BYTES_SENT,LOCAL_BYTES_RECVD,REMOTE_BYTES_SENT,REMOTE_BYTES_RECVD  
Return code: 1
Stdout: get_sockaddr_family_addr_port family mismatch 10 vs 2

Stderr: netperf: send_omni: connect_data_socket failed: Invalid argument

NetperfDemoRunner TCP upload BE finished
```

As the command runs fine without `--local-bind`, I suppose this is not of high importance, nonetheless, I wanted to report this.
Also, the irtt for latency measurement runs fine in this test, it's only the netperf for IPv4 that fails.

Full verbose output:
[verbose_rrul46compete.txt](https://github.com/tohojo/flent/files/7267355/verbose_rrul46compete.txt)


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