Fixing several timeout quirks at tftpd and tftp:

- move TIMEOUT* defines to arpa/tftp.h, as they are used several times
  in tftpd and tftp, and the values are part of the RFC definition.
- tftpd and tftp did count the total retransmission time in retries
  instead in seconds.  fixed.
- tftpd rexmt timeout was hardcoded by a define and therefore didn't
  changed when the timeout option was sent.  fixed.
- limit total retransmission timeout in tftp to also 255 seconds.
- replace obvious atoi()'s by strtonum().

ok claudio@

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