vagrant: add Vagrantfile to test native in FreeBSD

dist/tools/vagrant/freebsd/README.md

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+# RIOT FreeBSD VM
+
+## About
+This provides a [Vagrantfile] to compile and test the RIOT [`native`][native]
+platform on FreeBSD stable (12.1).
+
+## Requirements
+Make sure your system satisfies the latest version of all following dependencies:
+* [VirtualBox](https://www.virtualbox.org/wiki/Downloads)
+* [VirtualBox Extension Pack](https://www.virtualbox.org/wiki/Downloads)
+* [Vagrant](https://www.vagrantup.com/downloads.html)
+
+## General usage
+The following commands must be run from this directory on the host system
+
+```
+vagrant plugin install vagrant-disksize # for big enough disk
+vagrant up
+vagrant provision   # depending on the vagrant version this might alreardy be
+                    # executed with vagrant up
+```
+This will start up and set-up the virtual machine.
+```
+vagrant ssh
+```
+This logs you into the VM as vagrant user.
+
+See the general vagrant [README.md](../README.md) for more commands.
+
+## Inside the VM
+Once logged in to the VM you can run compile and run tests e.g.
+
+```sh
+make -C tests/shell all -j
+make -C tests/shell test
+```
+
+Even tests requiring network interface access should be able to work:
+
+```sh
+sudo dist/tools/tapsetup/tapsetup
+make -C tests/gnrc_dhcpv6_client_6lbr all -j16
+sudo make -C tests/gnrc_dhcpv6_client_6lbr test
+```
+
+[Vagrantfile]: ./Vagrantfile
+[native]: https://doc.riot-os.org/group__boards__native.html

dist/tools/vagrant/freebsd/Vagrantfile

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+$init_riot = <<-INIT_RIOT
+  # vim for xxd
+  pkg install -y bash git gmake gcc cmake afl afl++ \
+      python3 py37-pip py37-scipy py37-pycrypto py37-cython py37-scapy \
+      vim
+  chsh -s /usr/local/bin/bash vagrant
+  if ! [ -d /home/vagrant/RIOT ]; then
+      git clone --recurse-submodules https://github.com/RIOT-OS/RIOT /home/vagrant/RIOT
+  fi
+  chown -R vagrant: /home/vagrant/RIOT
+  curl https://raw.githubusercontent.com/RIOT-OS/riotdocker/master/requirements.txt \
+      > /tmp/requirements.txt
+  su - vagrant -c "pip install --user -r /tmp/requirements.txt"
+  # install most current pexpect to prevent async bug
+  su - vagrant -c "pip install --upgrade --user pexpect"
+  grep -q "export MAKE=gmake" /home/vagrant/.profile || \
+      echo "export MAKE=gmake" >> /home/vagrant/.profile
+  grep -q "export LINK=gcc" /home/vagrant/.profile || \
+      echo "export LINK=gcc" >> /home/vagrant/.profile
+  grep -q "export CC=gcc" /home/vagrant/.profile || \
+      echo "export CC=gcc" >> /home/vagrant/.profile
+  grep -q 'export PATH=/home/vagrant/.local/bin:${PATH}' /home/vagrant/.profile || \
+      echo 'export PATH=/home/vagrant/.local/bin:${PATH}' >> /home/vagrant/.profile
+  # make gmake default make
+  if ! [ -h /home/vagrant/.local/bin/make ]; then
+      # might not be a symlink, so remove
+      rm  -f /home/vagrant/.local/bin/make
+      su - vagrant -c 'ln -s /usr/local/bin/gmake /home/vagrant/.local/bin/make'
+  fi
+INIT_RIOT
+
+Vagrant.configure("2") do |config|
+  config.vm.define "RIOT-FreeBSD"
+  config.vm.box = "freebsd/FreeBSD-12.1-STABLE"
+  config.disksize.size = '50GB'
+  config.vm.provision "shell",
+    inline: $init_riot
+end