dns/opendnssec2: Typo causes a conversion script to fail

[ultima]

Summary

• Revision Bump
• Fix typo in the Port's Makefile causes a failure in a conversion script
• Added LICENSE_FILE
• Sorted Makefile
• Removed append flag on SUB_FILES, unneeded

PR\: 221144
Submitted by\: <[e-mail]> (maintainer)
Reviewed by\: lifanov (mentor), matthew (mentor)
Approved by\: lifanov (mentor), matthew (mentor)
MFH\: 2017Q3
Differential Revision\: https://reviews.freebsd.org/DXXXXX

Test Plan

portlint:
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
WARN: Makefile: new ports should not set PORTREVISION.
0 fatal errors and 2 warnings found.

poudriere:
103i386
103amd64
110i386
110amd64
12i386
12amd64

[ultima]

• Removed append flag on SUB_FILES, unneeded

[matthew]