Move array_remove_duplicate() to util.inc
Set IPsec VTI MTU to configured value at boot. Implements #9111
Implement system_get_arp_table()
Teach dhcrelay about upstream and downstream interfaces. Fixes #9466
No config changes or UI changes, it is handled automatically.
Merge pull request #4069 from chewrocca/master
Azure DDNS whitespace only
Update services.inc
Update dyndns.class
Merge pull request #3998 from NanoCaiordo/patch-is_fqdn
Merge pull request #4043 from artooro/pingcheck
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