Vagrant was not behaving correctly in configurations where there was
a static IP on a VirtualBox `intnet` interface and a DHCP `:hostonly`
interface configured.
Since `machine_ip` attempted to get static addresses `||` dynamic
addresses, it would simply use the static machine address and
continue.
This commit corrects this behaviour by collecting all static and
dynamic addresses into the `machine_ip` array instead of just one or
the other.
The result of this is a correctly generated `/etc/exports` on the
host machine, allowing NFS mounts to work correctly in this type of
environment.
ed708645b2