Use vagrant cloud base boxes for sanity checks

spec/acceptance/fixtures/auto-detect-with-provisioning.rb

@@ -1,8 +1,14 @@
 Vagrant.configure("2") do |config|
+  config.vm.provider :virtualbox do |_, override|
+    override.vm.box = "chef/ubuntu-14.04"
+  end
+
+  config.vm.provider :lxc do |_, override|
+    override.vm.box = "fgrehm/trusty64-lxc"
+  end
+
   config.cache.auto_detect = true
   config.cache.scope = :machine
 
-  config.vm.box = 'precise64'
-  config.vm.box_url = 'http://files.vagrantup.com/precise64.box'
   config.vm.provision :shell, inline: 'apt-get update && apt-get install -y git'
 end

spec/acceptance/fixtures/auto-detect.rb

@@ -1,6 +1,12 @@
 Vagrant.configure("2") do |config|
+  config.vm.provider :virtualbox do |_, override|
+    override.vm.box = "chef/ubuntu-14.04"
+  end
+  config.vm.provider :lxc do |_, override|
+    override.vm.box = "fgrehm/trusty64-lxc"
+  end
+
   config.cache.auto_detect = true
-  config.vm.box = 'precise64'
-  config.vm.box_url = 'http://files.vagrantup.com/precise64.box'
+
   config.vm.provision :shell, inline: 'echo Hello!'
 end

spec/acceptance/fixtures/no-cachier-simple.rb

@@ -1,4 +1,8 @@
 Vagrant.configure("2") do |config|
-  config.vm.box = 'precise64'
-  config.vm.box_url = 'http://files.vagrantup.com/precise64.box'
+  config.vm.provider :virtualbox do |_, override|
+    override.vm.box = "chef/ubuntu-14.04"
+  end
+  config.vm.provider :lxc do |_, override|
+    override.vm.box = "fgrehm/trusty64-lxc"
+  end
 end

spec/acceptance/fixtures/no-cachier-with-provisioning.rb

@@ -1,5 +1,10 @@
 Vagrant.configure("2") do |config|
-  config.vm.box = 'precise64'
-  config.vm.box_url = 'http://files.vagrantup.com/precise64.box'
+  config.vm.provider :virtualbox do |_, override|
+    override.vm.box = "chef/ubuntu-14.04"
+  end
+  config.vm.provider :lxc do |_, override|
+    override.vm.box = "fgrehm/trusty64-lxc"
+  end
+
   config.vm.provision :shell, inline: 'echo Hello!'
 end