DTLS retransmit too fast

[mcr]

The DTLS code in openssl starts the retransmit timer at 1s, and does exponential backoff to a limit of 60s.
This needs to be increases for 802.15.4 speeds.
The question of why the first transmit is 1 large packet, and subsequent packets are 5-pieces is also concerning, and has been reported at: openssl/openssl#8166