Merge vagrant_40_gb_xenial into ubuntu/xenial [a=patviafore] [r=rcj]

Make Ubuntu Vagrant box 40G. (LP: #1580596)

Vagrant images were previously put at 10G, but this was a regression
from Trusty, in which they were 40G. This made it a tough sell for
users to upgrade if they were using a Ubuntu desktop experience.

This change does not impact disk usage as Vagrant with the virtualbox
provider dynamically allocates space with the VMDK. On a test system,
the VMDK took up 1.1G of disk space according to df, and after
creating a 2G file in Vagrant, the VMDK grew to 3.1G.

Therefore, users who are running on a system with little free space will
not see adverse effects if they upgrade to a new vagrant image

MP: https://code.launchpad.net/~patviafore/livecd-rootfs/+git/livecd-rootfs/+merge/384636

debian/changelog

@@ -1,5 +1,8 @@
 livecd-rootfs (2.408.62) UNRELEASED; urgency=medium
 
+  [ Patrick Viafore ]
+  * Increase Vagrant disk size from 10G to 40G (LP: #1580596)
+
   [ Cody Shepherd ]
   * buildd: ext4: change tar transform target to match changes in bionic+
   * buildd: Skip jasper for buildd subproject

live-build/ubuntu-cpc/hooks.d/base/vagrant.binary

@@ -105,7 +105,7 @@ distro=$(chroot chroot lsb_release --id --short | tr [:upper:] [:lower:])
 # Get the VMDK in place
 prefix="${distro}-${suite}-${version}-cloudimg"
 vmdk_f="${box_d}/${prefix}.vmdk"
-create_vmdk ${derivative_img} ${vmdk_f}
+create_vmdk ${derivative_img} ${vmdk_f} 40960
 
 ####################################
 # Create the ConfigDrive