core: SSHRun uses new ShellQuote util

lib/vagrant/action/builtin/ssh_run.rb

@@ -1,6 +1,7 @@
 require "log4r"
 
 require "vagrant/util/ssh"
+require "vagrant/util/shell_quote"
 
 module Vagrant
   module Action
@@ -33,10 +34,7 @@ module Vagrant
           end
 
           # Get the command and wrap it in a login shell
-          command = env[:ssh_run_command]
-          command = command.gsub(/'/) do |m|
-            "#{m}\\#{m}#{m}"
-          end
+          command = ShellQuote.escape(env[:ssh_run_command], "'")
           command = "#{env[:machine].config.ssh.shell} -c '#{command}'"
 
           # Execute!