Made Deb8 VF find IP correctly

[Willsparker]

ifconfig is unfortunately not a thing in Debian8, therefore I found a new way to output a list of IP addresses, like the rest of the Vagrantfiles do.

[sxa]

/sbin/ifconfig exists on Debian.

Although if you've tested that this PR also works everywhere I'd be okj with including it. Looks like you're still having issues with IP detection though based on your last Debian run

[Willsparker]

@sxa555 This works to retrieve the IP and put it in the shared folder. However, there's a weird quirk of just the Debian8 VM, in which it won't update the shared folder once it's provisioned itself, therefore vagrantPlaybookCheck.sh can't find the hosts.tmp file that should be there but isn't. I'll put a fix into this PR if I can find one.

[Willsparker]

Looking at the output and a bit of googling later, I believe it's because the Vagrant Box doesn't come packaged with Guest Additions :

==> adoptopenjdkD8: Machine booted and ready!
==> adoptopenjdkD8: Checking for guest additions in VM...
    adoptopenjdkD8: No guest additions were detected on the base box for this VM! Guest
    adoptopenjdkD8: additions are required for forwarded ports, shared folders, host only
    adoptopenjdkD8: networking, and more. If SSH fails on this machine, please install
    adoptopenjdkD8: the guest additions and repackage the box to continue.
    adoptopenjdkD8: 
    adoptopenjdkD8: This is not an error message; everything may continue to work properly,
    adoptopenjdkD8: in which case you may ignore this message.
==> adoptopenjdkD8: Setting hostname...
==> adoptopenjdkD8: Configuring and enabling network interfaces...

and : hashicorp/vagrant#6940

I've found a plugin that should automatically install the Guest Additions on the box (vagrant vb-guests), so I'll play around with that. If all else fails, I'll look for a new Debian8 Box

[Willsparker]

Using a different box that has guest additions pre-installed has seemed to work in making the playbook run : https://ci.adoptopenjdk.net/job/VagrantPlaybookCheck/OS=Debian8,label=vagrant/228/console
I attempted to use the vagrant plugin vb-guests however the plugin was unable to install the guest additions as it couldn't find a particular apt-package : linux-headers-3.16.0-9-amd64

[Willsparker]

So, the original box I was attempting to use was the following: https://app.vagrantup.com/generic/boxes/debian8
And the one I've found to work is this: https://app.vagrantup.com/roboxes/boxes/debian8
Which seem to be provided by the same company.
However, the roboxes Debian box comes with the Guest Additions already installed.
@sxa555 also found that the vagrant vb-guest plugin was not working on the generic box as the kernel package version is 9 when it is meant to be 10, as it is in the robox box. This means the plugin is unable to install the package above, which is a dependency,
In a perfect world, we'd want to use the generic box as they seem to be the most official provider of Vagrant boxes in most OSs, however to do that we'd need to find a way to update the kernel version to 10, before running vagrant up as the vagrant vb-guest plugin runs and attempts to install the Guest Additions (and therefore the dependency that isn't there) before the initial provision script.