Fix a little problem in BSD

On BSD ZSH is installed on a different location than on linux. So we
link it there to make sure our later scripts will work.

test-bsd-vm/bootstrap.sh

@@ -3,6 +3,7 @@
 # Install ZSH
 sudo pkg install -y zsh
 sudo chsh -s `which zsh` vagrant
+sudo ln -s /usr/local/bin/zsh /usr/bin/zsh
 
 # Install git
 sudo pkg install -y git