Free the request when we remove it from the packet list

Only as the server is exiting.  request_done() assumes that it
can yank() the packet from the list and still poke it.  That means
we can't add a freeNode() function to fr_packet_list_create()
Edit clients.conf
Added a missing commented-out closing curly bracket
Merge pull request #513 from spaetow/master

Edit clients.conf
Explain why DHCP decoding failed
Missing break
Consistent error messages
Proper checks for error message functions
Tee to the log file instead

When people are running in foreground mode they probably want to see the result of the backtrace...
Add -D to more utilities