BugFix when deploy symfony 1.4 with user_sudo = true

This is a bugFix in the thask :cc (Clear the cache)

When i try to deploy a project with user_sudo = true, the line 

     run "#{try_sudo} sh -c 'cd #{latest_release} && #{try_sudo} #{php_bin} ./symfony cache:clear'"


in clear cache fail, because the 2do #{try_sudo} crash the command line to the call with sudo.