core: Fix synced folder creation (AKA first bug caught with vagrant-spec)

Thanks @mitchellh!

lib/vagrant-lxc/driver.rb

@@ -62,21 +62,21 @@ module Vagrant
 
       def share_folders(folders)
         folders.each do |folder|
-          guestpath = rootfs_path.join(folder[:guestpath].gsub(/^\//, ''))
+          share_folder(folder[:hostpath], folder[:guestpath])
-          unless guestpath.directory?
-            begin
-              @logger.debug("Guest path doesn't exist, creating: #{guestpath}")
-              @sudo_wrapper.run('mkdir', '-p', guestpath.to_s)
-            rescue Errno::EACCES
-              raise Vagrant::Errors::SharedFolderCreateFailed, :path => guestpath.to_s
-            end
-          end
-
-          share_folder(folder[:hostpath], guestpath)
         end
       end
 
       def share_folder(host_path, guest_path)
+        guest_path = rootfs_path.join(guest_path.gsub(/^\//, ''))
+        unless guest_path.directory?
+          begin
+            @logger.debug("Guest path doesn't exist, creating: #{guest_path}")
+            @sudo_wrapper.run('mkdir', '-p', guest_path.to_s)
+          rescue Errno::EACCES
+            raise Vagrant::Errors::SharedFolderCreateFailed, :path => guest_path.to_s
+          end
+        end
+
         @customizations << ['mount.entry', "#{host_path} #{guest_path} none bind 0 0"]
       end