Updates vagrant and ansible scripts.

As https://bugs.launchpad.net/cloud-images/+bug/1569237 is now fixed, we
can use the official Ubuntu Xenial 16.04 box.

The sudo attribute of ansible scripts now longer works so we use a
workaround by using become become_user, become_method attributes.

Vagrantfile

@@ -7,9 +7,7 @@ VAGRANTFILE_API_VERSION = "2"
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   # fixes 'Inappropriate ioctl for device'
   config.ssh.shell = "bash -c 'BASH_ENV=/etc/profile exec bash'"
-  # 'official' Ubuntu box does not have vagrant user (https://bugs.launchpad.net/cloud-images/+bug/1569237)
-  # so use another box as specified in issue
-  config.vm.box = "bento/ubuntu-16.04"
+  config.vm.box = "ubuntu/xenial64"
   config.vm.provision 'Initial setup', type: 'shell', path: "provisioning/scripts/setup.sh"
 
   config.vm.define 'load-test' do |machine|

provisioning/roles/apt/tasks/main.yml

@@ -1,12 +1,16 @@
 ---
 - name: Update the APT repository
   apt: update_cache=yes
-  sudo: True
+  become: yes
+  become_method: sudo
+  become_user: root
   tags:
     - needs_internet_connection
 
 - name: Upgrade the packages
   apt: upgrade=full
-  sudo: True
+  become: yes
+  become_method: sudo
+  become_user: root
   tags:
     - needs_internet_connection

provisioning/roles/freelan-build/tasks/main.yml

@@ -12,7 +12,9 @@
     - help2man
   tags:
     - build
-  sudo: True
+  become: yes
+  become_method: sudo
+  become_user: root
 
 - name: Checkout freelan sources
   git: repo={{ local_sources_root }} dest={{ sources_root }} version={{ repository_version }} accept_hostkey=yes recursive=no

provisioning/roles/freelan-load-test/tasks/main.yml

@@ -5,7 +5,9 @@
     - gdb
     - valgrind
     - screen
-  sudo: True
+  become: yes
+  become_method: sudo
+  become_user: root
 
 - name: Create nodes configuration directory
   file: dest={{ nodes_config_root }} state=directory

provisioning/roles/freelan-speed-test/tasks/main.yml

@@ -4,7 +4,9 @@
   with_items:
     - screen
     - iperf
-  sudo: True
+  become: yes
+  become_method: sudo
+  become_user: root
 
 - name: Create configuration directory
   file: dest={{ config_root }} state=directory