Disentangle log_debug() output from tick_msg() output.

Disentangle log_debug() output from tick_msg() output.

Simplifies -v output, and reduces non-'-v' output.

Reduce non-'-v' output further by only displaying the first 'link up'
event.

Restore behaviour specified in dhclient.conf(5) of going daemon after
link-timeout seconds, rather than waiting another link-timeout seconds
for a lease to be accepted.

Lease verbiage problem reported, and fix tested by Mihai Popescu. Thanks!

Link verbiage problems reported, fix tested & ok tb@.