Add pkt-gen, a packet sink/source using the netmap API

[shurd]

Summary

Port for pkt-gen. An older version lives in /usr/src/tools/tools/netmap
but it's missing a number of new changes.

Test Plan

I will be testing this with my existing test framework

[shurd]

Doesn't build on -CURRENT due to pointer alignment issues.

[shurd]

Avoid unaligned access for all the normal reasons, plus the new warnings

[mat]

net/pkt-gen/Makefile

4 ↗

(On Diff #32379)

If this *is* the real version of the software, it is fine, though you should be using DISTVERSION and not PORTVERSION.

If you made this up, and this is based on the commit date, you must prefix the version with a g (for git):

DISTVERSION=  g2017.08.06

16 ↗

(On Diff #32379)

USES should be before USE_GITHUB. See 14.7. USES and USE_x

28 ↗

(On Diff #32379)

${WRKSRC}/pkt-gen

net/pkt-gen/pkg-descr

1 ↗

(On Diff #32379)

The pkg-descr file must contain a description that is much longer than the COMMENT in the Makefile, usually a two or three lines paragraph.

[shurd]

Fix up usage()

[shurd]

Thanks mat, I'll address these soon.

[shurd]

Incorporate feedback from mat

[shurd]

And fix the do-install target

[mat]

net/pkt-gen/Makefile

19–20 ↗

(On Diff #32382)

Would probably be easier to do this:

PATCH_WRKSRC= ${WRKSRC}/..

[shurd]

Use PATCH_WRKSRC per mat.

It certainly is easier.

[shurd]

Remove cruft

(Already it builds up!)