ports/183806: update ipv6gen port after move to Github

[Vladimir Kotal]

>Number:         183806
>Category:       ports
>Synopsis:       update ipv6gen port after move to Github
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          maintainer-update
>Submitter-Id:   current-users
>Arrival-Date:   Sat Nov 09 11:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Vladimir Kotal
>Release:        
>Organization:
>Environment:
>Description:
I moved the ipv6gen project over to Github, the following updates needs to be made:

pkg-descr - change URL to https://github.com/vladak/ipv6gen/wiki/IPv6-prefix-generator
Makefile - change MASTER_SITES to point to Github, EXTRACT_SUFX to .tar.gz
distinfo - change SHA256 digest to aaf0638ba78eac56b667f504433580b9edba43e861d7d8596091c8542313583b and size to 12978 (to match https://github.com/vladak/ipv6gen/archive/1.0.tar.gz)

Thanks.
>How-To-Repeat:

>Fix:


>Release-Note:
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