wtap(4): write atf test scripts to test all iface mode

[enweiwu]

Summary

Below is the planned commit.

Test script locates in tests/sys/net80211, which is written in atf-sh(3), and it can test parts of net80211 stack via interfaces created by wtap(4).

The test script needs tools/tools/wtap, which makes the test not self-contained, I'm discussing with Li-Wen Hsu to figure out the better way to address it.

[lwhsu]

We also need to add this directory to tests/sys/Makefile

tests/sys/net80211/sta_assoc.c

4

This line is not needed.

[lwhsu]

For the record, we're thinking to move the tools to /usr/sbin as wtapctl(8).

[lwhsu]

tests/sys/net80211/sta_assoc.c

17

Sneaked line from copy/paste?

tests/sys/net80211/wtap.sh

2

This line add be added automatically when being installed to /usr/tests

2

s/add be/will be/