Fix some issues reported by lintian

See merge request !4

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Fix some issues reported by lintian

See merge request !3

Changes-By: lintian-brush
Fixes: lintian: debian-changelog-has-wrong-day-of-week
See-also: https://lintian.debian.org/tags/debian-changelog-has-wrong-day-of-week.html

Changes-By: lintian-brush
Fixes: lintian: missing-built-using-field-for-golang-package
See-also: https://lintian.debian.org/tags/missing-built-using-field-for-golang-package.html

Changes-By: lintian-brush
Fixes: lintian: uses-debhelper-compat-file
See-also: https://lintian.debian.org/tags/uses-debhelper-compat-file.html

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Changes-By: lintian-brush
Fixes: lintian: missing-build-dependency-for-dh-addon
See-also: https://lintian.debian.org/tags/missing-build-dependency-for-dh-addon.html

Changes-By: lintian-brush
Fixes: lintian: trailing-whitespace
See-also: https://lintian.debian.org/tags/trailing-whitespace.html

Set KVM's guest name

See merge request !2

Match the beginning of libvirt's kvm invocation, and help with VM
identification.

Vmine will refuse to create more VMs once it has reached the limit for
allocated memory (regardless of how much RSS the qemu processes
actually have, so it's not exactly an accurate measure).

Fixes issue #1.

Not disable itself after the first one...

The Package Registry API isn't yet capable of deleting old package
files, so we resort to a different strategy.

This makes the log output more directly readable as the commands being
executed are pre-rendered on creation.

Apparently sudo is unhappy if it can't resolve the hostname OR if it
can't get a NXDOMAIN from a DNS server, which is weird but anyway here
we are.

This is enough to provide a certain level of drop-in compatibility
with Vagrant.

It prevents access to /dev/net/tun which we need.