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When setting 'vpn ipsec logging log-level 0', DPD informational
messages (log level 1) were still appearing in the system journal.
The root cause is that charon-systemd reads both `charon-systemd.conf`
and `charon-logging.conf` and applies the higher of the two log levels
to the journal. The VyOS only managed `charon-systemd.conf`, leaving
`charon-logging.conf` at its default level of 1, which silently overrode
the user-configured level.
Fix this by rendering `charon-logging.conf` on every commit with
syslog backend set to -1 (silent), making `charon-systemd.conf`
the sole authoritative source for journal log verbosity.
This also eliminates duplicate log entries in the journal that occurred
when both backends were active and writing to the same destination.
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