ports/153781: Update port: net/isc-dhcp41-server Concurrent IPv4 DHCP and DHCPv6

[Douglas William Thrift]

>Number:         153781
>Category:       ports
>Synopsis:       Update port: net/isc-dhcp41-server Concurrent IPv4 DHCP and DHCPv6
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          update
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 08 00:20:05 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Douglas William Thrift
>Release:        FreeBSD 8.1-RELEASE-p2 amd64
>Organization:
>Environment:
System: FreeBSD justonenight.douglasthrift.net 8.1-RELEASE-p2 FreeBSD 8.1-RELEASE-p2 #1: Mon Nov 29 15:46:26 PST 2010 root at justonenight.douglasthrift.net:/usr/obj/usr/src/sys/FURTHERONUPTHEROAD amd64
>Description:
Since ISC dhcpd 4.1 now supports DHCPv6, but a single instance of the
daemon can't do both IPv4 DHCP and DHCPv6, it would be nice if the rc.d
script from the port could be configured to start the daemon twice.

The mailing list discussion about this starts at:
    http://lists.freebsd.org/pipermail/freebsd-ports/2011-January/065284.html

On the FreeBSD ports mailing list, Doug Barton suggested using name="${0##*/}"
in the rc.d script and symlinking to it. This sounds like a good solution to me.
I think we should name the symlink "dhcpd6" as dhcpd already uses that name for
at least the leases file and pid file when running with -6 by default.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: