dhcp: T9278: move DHCP client hook tracing to a gated debug level

Each lease event emitted some fifteen daemon.info lines tracing internal steps
rather than recording a change. Add a "debug" level to logmsg(), silenced unless
/tmp/vyos.dhclient.debug exists, following the flag file convention used for FRR
and ifconfig. Demoting alone would not help, as journald shows all priorities by
default. Fifteen tracing messages move to debug; the sixteen recording an actual
change stay at info.

Also fix logmsg(): "warn" had no case arm although it is used, and the global
LOG_PRIO leaked the preceding call's priority. It is now local.

0 files changed, 0 insertions, 0 deletions