OPNSense/core a88988e — src/etc/inc interfaces.inc, src/opnsense/service/tests/config config.xml
interfaces: remove use of adv_dhcp6_prefix_interface_statement_sla_id
Section of code I've removed had been removed previously as during recent
PR's the ability to iterate through the interfaces was added. This 'solo'
bit of code appears to have made its way back in, don't know where and
don't know when as the song goes. Remove SLA_ID from Prefix interface.
It's collected from the LAN settings
(cherry picked from commit d1fc5afc2bc186befa82ebbacdde3ba7f4dda55a)
UnifiedSplitRaw
