Remove apt update from Vagrantfile

Its now done in run_tests.sh which is run by the
Vagrant provisioner

Change-Id: I13696c7adc57f25bb4ac251d66163fcc49ad75d1

Vagrantfile

@@ -0,0 +1,12 @@
+Vagrant.configure(2) do |config|
+  config.vm.box = "ubuntu/trusty64"
+  config.vm.provider "virtualbox" do |v|
+    v.memory = 2048
+    v.cpus = 2
+  end
+  config.vm.provision "shell", inline: <<-SHELL
+    sudo su -
+    cd /vagrant
+    ./run_tests.sh
+  SHELL
+end