Remove Trusty support from tests repository

Change-Id: I66b5bef5ec55b87902bf25f8bc56dfb0d33a5ff1
Implements: blueprint trusty-removal

Vagrantfile

@@ -1,9 +1,9 @@
 Vagrant.configure(2) do |config|
-  config.vm.box = "ubuntu/trusty64"
+  config.vm.box = "ubuntu/xenial64"
   config.vm.provision "shell", inline: <<-SHELL
     sudo su -
     cd /vagrant
     apt-get update
     ./run_tests.sh
   SHELL
-end
+end

bindep.txt

@@ -32,7 +32,7 @@ libselinux-python [platform:rpm]
 # For SSL SNI support
 python-pyasn1               [platform:dpkg]
 python-openssl              [platform:dpkg]
-python-ndg-httpsclient      [platform:ubuntu !platform:ubuntu-trusty]
+python-ndg-httpsclient      [platform:ubuntu]
 python2-pyasn1              [platform:rpm]
 pyOpenSSL                   [platform:rpm]
 python-ndg_httpsclient      [platform:rpm]

common-tasks/test-force-package-cache-update.yml

@@ -13,14 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# The "command" module is used here instead of "lineinfile" because all we
-#  want to do is uncomment the backports repo if its found.
-- name: Ensure trusty-backports are available
-  command: "sed -i '/deb.*-backports/s|^#\\s||g' /etc/apt/sources.list"
-  when:
-    - ansible_pkg_mgr == 'apt'
-    - ansible_distribution_release | lower == 'trusty'
-
 - name: First ensure apt cache is always refreshed
   apt:
     update_cache: true