Default route not set properly when :use_dhcp_assigned_default_route => true; net-tools not present in Debian stretch

[jhosteny]

Vagrant version

Vagrant 1.9.3

Host operating system

OS X 10.12.5

Guest operating system

vagrant@stretch:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.0 (stretch)
Release: 9.0
Codename: stretch

Vagrantfile

Vagrant.configure("2") do |config|
  config.vm.box = "debian/stretch64"
  config.vm.network "public_network", bridge: "en0: Wi-Fi (AirPort)", :use_dhcp_assigned_default_route => true
end

Debug output

https://gist.github.com/jhosteny/f38490d505b30742ab577c22524841e7

Expected behavior

The default route should have been set on eth1.

route should be replaced by ip route, as net-tools is deprecated. There is also precedence in the referenced ticket.

Actual behavior

The default route is still set to eth0.

Steps to reproduce

1. Run vagrant up with the provided Vagrantfile
2. Run ip route get 8.8.8.8 to see the incorrect default route

References

GH-7460 provides precedence for replacing net-tools route with ip.

[ghost]

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