Remove unity, x11-utils and xvfb from test control file

[Jean-Baptiste Lallement]

The debian/tests/control file contains the following test dependencies:

Depends: @builddeps@,
         bzr,
         ca-certificates,
         git,
         golang-golang-x-net-dev,
         openssh-server,
         snapd,
         unity,
         x11-utils,
         xvfb

Tests that required these dependencies have been removed/skip and these deps should be dropped. unity is not available on debian (autopkgtest fails on snapd installation) and installation of these packages and their deps slows down autopkgtest considerably.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: snapd 2.21+17.04
ProcVersionSignature: Ubuntu 4.9.0-11.12-generic 4.9.0
Uname: Linux 4.9.0-11-generic x86_64
ApportVersion: 2.20.4-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jan 27 11:27:02 2017
InstallationDate: Installed on 2014-07-15 (927 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140520)
SourcePackage: snapd
UpgradeStatus: Upgraded to zesty on 2015-12-08 (415 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Federico Gimenez (fgimenez)]

Hi Jean-Baptiste, thanks for reporting this bug, the changes are proposed in https://github.com/snapcore/snapd/pull/2734

Cheers,