CI failures on nipa

Hi,

I'm looking at this one:

https://netdev-ctrl.bots.linux.dev/logs/vmksft/mptcp/results/776501/6-mptcp-connect-sh/

the output is strange:

https://netdev-ctrl.bots.linux.dev/logview.html?f=/logs/vmksft/mptcp/results/776501/6-mptcp-connect-sh/stdout#L114

the first nstat dump includes apparently the counters from all the
previous runs, which is unexpected: the nstat_init/nstat_get/pr_nstat
dance should allow showing the data from current run only right?

Also I think mptcp_lib_wait_timeout completes too late (after ~60 secs),
when the listener already bailed out due to accept timeout (after ~30
secs), so it does not show any info on the listener side. I fear it may
also race with the actuall `timeout` command completion showing socket
states after the user-space program completion.

Judging on the final status, I *think*/*guess* the (re)connect is
hanged, possibly due to bad remote address?!? It could be useful to
print out on stderr the reconnect destination address.

/P