OPNSense/core 0e95b0f. LICENSE plist, src/etc rc.kill_states

interfaces: remove rc.kill_states

There's no real world evidence this works or is needed today.
We do have to other state kills / flushes now, one works and
the other may be defunct.  To progress this remove this arcane
script and if the need arises rewrite it as something portable.

See:      https://redmine.pfsense.org/issues/1629
Also see: https://redmine.pfsense.org/issues/2887
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+0-90src/etc/rc.kill_states
+0-2src/opnsense/scripts/interfaces/ppp-linkdown.sh
+0-1LICENSE
+0-1plist
+0-944 files

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