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   Make send_packet() usage consistent. i.e. don't exit
   if send_packet(DISCOVER) fails.

   Distinguish between writev() and sendmsg() errors in
   send_packet() log messages.

   Check for short writes no matter how the packet is
   output. Return failure in this occurs. Check results
   of all send_packet() calls.

   If send_packet() fails, don't log that the DHCP message
   was sent.

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