pfSense/pfsense 8bffe22src/etc/inc interfaces.inc

Fix #8465: Preserve default gw when switch to BACKUP

interfaces_carp_set_maintenancemode() calls interface_carp_configure()
to each configured CARP and it ends up reconfiguring completely the
interface when it's not necessary.

Add a new parameter $maintenancemode_only to interface_carp_configure()
and use it to only change advskew to 254 when going to forced
maintenance mode and move it back to configured value when leaving
DeltaFile
+14-12src/etc/inc/interfaces.inc
+14-121 files

UnifiedSplitRaw