Add tests for usr.bin/grep from NetBSD

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Port over bin/ tests from NetBSD that don't break the build

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Add tcpdump testcases from NetBSD

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Port over basename, dirname, and gzip testcases from NetBSD

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Port over ifconfig testcases from NetBSD

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Add in entries for newly added tests from NetBSD

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>