Cleanup messages for retransmission when receiving ack #169

Job	Run time
run-checker (no-cmp)	1m 6s
run-checker (no-cms)	1m 10s
run-checker (no-dgram)	1m 10s
run-checker (no-dh)	1m 7s
run-checker (no-dtls)	1m 16s
run-checker (no-ec)	1m 3s
run-checker (no-ecx)	1m 7s
run-checker (no-http)	1m 11s
run-checker (no-legacy)	1m 10s
run-checker (no-sock)	1m 6s
run-checker (enable-ssl-trace)	1m 13s
run-checker (no-stdio)	1m 5s
run-checker (no-threads)	1m 11s
run-checker (no-thread-pool)	1m 8s
run-checker (no-default-thread-pool)	1m 8s
run-checker (no-tls)	1m 9s
run-checker (no-tls1_2)	1m 11s
run-checker (no-tls1_3)	1m 6s
run-checker (enable-trace enable-fips)	1m 20s
run-checker (no-ui)	1m 11s
run-checker (no-quic)	1m 15s
	24m 23s

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