disable RIP for general deployments (#3736)

RIP's method of gratuitous advertisements can accidentally create
routing loops or blackhole traffic when used in conjunction with DDM.

Author: internet-diglett

smf/switch_zone_setup/switch_zone_setup

@@ -37,8 +37,4 @@ for i in "${!USERS[@]}"; do
     fi
 done
 
-# enable ipv6 forwarding and routing
-pfexec routeadm -e ipv6-forwarding -u
-pfexec routeadm -e ipv6-routing -u
-
 exit $SMF_EXIT_OK