unbound-dhcp-leases-bridge: Replace leases file atomically

When there is a large number of leases, writing the file may
take a long time. When unbound is re-reading its configuration
in that time, the file might syntactically incorrect.

This change writes the file first and then moves it
to the right place in one transaction.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

config/rootfiles/core/130/filelists/files

@@ -18,6 +18,7 @@ usr/local/bin/ipsec-interfaces
 usr/local/bin/suricatactrl
 usr/local/bin/update-ids-ruleset
 usr/sbin/convert-snort
+usr/sbin/unbound-dhcp-leases-bridge
 var/ipfire/backup/bin/backup.pl
 var/ipfire/backup/include
 var/ipfire/general-functions.pl