doc: add link to vagrant+libvirt setup
doc: add link to vagrant+libvirt setup

Signed-off-by: Noah Watkins <86ecd7d1c53cf33a85014f7cab78876cb4491020@gmail.com>

rook/nfs,rook/rook,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/rook,rook/rook