tree de616234942c92bde7149cc7d4a215cda488d176
parent 6c7834629a5677802720a2efe496763f55bee269
author Andrew Cooks <andrew.d.cooks@boeing.com> 1551849371 +1000
committer Bruce A. Mah <bmah@es.net> 1560537534 -0700
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delay tearing down tcp control connections

The TEST_END message is racing with the server_timer_proc timer.
When the RTT is higher than a second, the timer wins the race
and closes the control socket before the results are exchanged.

This results in the client reporting:
"error - control socket has closed unexpectedly"
as reported in GH issue 751.

This change doesn't prevent the race, but significantly increases the
grace period based on a maximum RTT of 4 seconds and accounts for
the ten transitions in the iperf3 state machine.

(cherry picked from commit 34bdddb75194e880e6dbc6dcaa5b5386975c11b3)
(originally submitted by @acooks in #859)