Log Message:
Updating net/p5-Net-TFTP from 0.17nb2 to 0.18

pkgsrc changes:
- add license definition

Upstream changes:
0.18 -- Mon May 31 10:38:13 CDT 2010
  * Added support for IPv6 (patch from John Jason Brzozowski)
  * Added .gitignore file [Maik Hentsche]
  * added unit tests [Maik Hentsche]
  * added directory for unit test [Maik Hentsche]
  * handle unlink error [Maik Hentsche]
  * added unit test for missing host [Maik Hentsche]
  * Fix warning for new() without host argument [Maik Hentsche]