Allow setting container hostname from Vagrantfile

Closes #15

example/Vagrantfile

@@ -4,7 +4,9 @@
 Vagrant.require_plugin 'vagrant-lxc'
 
 Vagrant.configure("2") do |config|
-  config.vm.box = "ubuntu-cloud"
+  config.vm.box      = "ubuntu-cloud"
+  config.vm.hostname = 'ubuntu-cloud-box'
+
   config.vm.provider :lxc do |lxc|
     # ... soon to come lxc configs...
   end

lib/vagrant-lxc/action.rb

@@ -50,7 +50,6 @@ module Vagrant
           b.use ShareFolders
           b.use Network
           b.use ForwardPorts
-          b.use HostName
           b.use SaneDefaults
           b.use Customize
           b.use Boot
@@ -87,6 +86,7 @@ module Vagrant
           end
           b.use action_start
           b.use AfterCreate
+          b.use Vagrant::Action::Builtin::SetHostname
         end
       end
 
@@ -122,7 +122,7 @@ module Vagrant
               next
             end
 
-            # TODO: Implement our own DestroyConfirm or propose a builtin action for Vagrant core
+            # TODO: Implement our own DestroyConfirm
             b2.use Vagrant::Action::Builtin::Call, VagrantPlugins::ProviderVirtualBox::Action::DestroyConfirm do |env2, b3|
               if env2[:result]
                 b3.use Vagrant::Action::Builtin::ConfigValidate
@@ -132,7 +132,7 @@ module Vagrant
                 # TODO: VirtualBox provider has a CleanMachineFolder action, do we need something similar?
                 # TODO: VirtualBox provider has a DestroyUnusedNetworkInterfaces action, do we need something similar?
               else
-                # TODO: Implement our own DestroyConfirm or propose a builtin action for Vagrant core
+                # TODO: Implement our own MessageWillNotDestroy
                 b3.use VagrantPlugins::ProviderVirtualBox::Action::MessageWillNotDestroy
               end
             end
@@ -182,7 +182,6 @@ module Vagrant
       class ClearForwardedPorts < BaseAction; end
       class PrepareForwardedPortCollisionParams < BaseAction; end
       class ClearSharedFolders < BaseAction; end
-      class HostName < BaseAction; end
       class Customize < BaseAction; end
     end
   end

lib/vagrant-lxc/action/is_running.rb

@@ -3,7 +3,6 @@ module Vagrant
     module Action
       class IsRunning < BaseAction
         def call(env)
-          # Set the result to be true if the machine is created.
           env[:result] = env[:machine].state.running?
 
           # Call the next if we have one (but we shouldn't, since this