OPNSense/core d4b6021src/etc/inc interfaces.inc

on link down, don't try to remove carp addresses, for https://github.com/opnsense/core/issues/2780

(cherry picked from commit e720c570d9282220679bbc260d0284fcad0babf9)
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+5-1src/etc/inc/interfaces.inc
+5-11 files

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