driver/cli: Deal with namespaces args for lxc-attach when the sudo wrapper script is in place [GH-300]

lib/vagrant-lxc/driver/cli.rb

@@ -97,6 +97,11 @@ module Vagrant
             opts       = cmd.pop
             namespaces = Array(opts[:namespaces]).map(&:upcase).join('|')
 
+            # HACK: The wrapper script should be able to handle this
+            if @sudo_wrapper.wrapper_path
+              namespaces = "'#{namespaces}'"
+            end
+
             if namespaces
               if supports_attach_with_namespaces?
                 extra = ['--namespaces', namespaces]

lib/vagrant-lxc/sudo_wrapper.rb

@@ -4,6 +4,8 @@ module Vagrant
       # Include this so we can use `Subprocess` more easily.
       include Vagrant::Util::Retryable
 
+      attr_reader :wrapper_path
+
       def initialize(wrapper_path = nil)
         @wrapper_path = wrapper_path
         @logger       = Log4r::Logger.new("vagrant::lxc::sudo_wrapper")