Install python2 for Ubuntu 16.04 and CentOS 7 in Vagrant

- Fix double `end` in Vagrantfile
- Install python2 for Ubuntu 16.04 and CentOS 7 before executing test
  script.

Change-Id: Iec2ede3d94fd166d2e65b7e174f0f8dc51f720c0

Vagrantfile

@@ -3,14 +3,12 @@ Vagrant.configure(2) do |config|
     v.memory = 2048
     v.cpus = 2
   end
-  end
 
   config.vm.define "ubuntu1604" do |xenial|
     xenial.vm.box = "ubuntu/xenial64"
     xenial.vm.provision "shell", inline: <<-SHELL
       sudo su -
       cd /vagrant
-      apt-get update
       ./run_tests.sh
     SHELL
   end

run_tests.sh

@@ -17,6 +17,16 @@ set -euov
 
 FUNCTIONAL_TEST=${FUNCTIONAL_TEST:-true}
 
+# Install python2 for Ubuntu 16.04 and CentOS 7
+
+if which apt-get; then
+     sudo apt-get update && sudo apt-get install -y python
+fi
+
+if which yum; then
+     sudo yum install -y python
+fi
+
 # Install pip
 if [ ! "$(which pip)" ]; then
   curl --silent --show-error --retry 5 \