the user should not be ignored if possible even if the kernel does not support the prerequisite feature. Discussed with: ume
- Add afexists() check to address family specific rc.d scripts. A script for an AF will be silently ignored if the kernel has no support for the AF.
- Add rc.d/stf and rc.d/faith for stf(4) and faith(4). - Remove rc.d/auto_linklocal and rc.d/network_ipv6. - Move rc.d/sysctl to just before FILESYSTEMS because rc.d/netif depends on some sysctl variables. Reviewed by: brooks MFC after: 3 days