NFS action no longer needs to recover from anything

lib/vagrant/action/vm/nfs.rb

@@ -36,15 +36,6 @@ module Vagrant
           mount_folders if !folders.empty?
         end
 
-        def recover(env)
-          # Ignore any VagrantErrors, because they were expected and
-          # will cause the VM to stick around.
-          return if env["vagrant.error"].is_a?(Errors::VagrantError)
-
-          # Otherwise, clear the NFS exports.
-          clear_nfs_exports(env)
-        end
-
         # Returns the folders which are to be synced via NFS.
         def folders
           @folders ||= {}