Multisite module has been moved from extended-templating-kit to multisite.

When upgrading an Magnolia instance to 5.2.1 with a site which extends another site using an absolute path, the site will not work since the path is not updated.

For instance:

Before upgrade

• modules
  • extended-templating-kit
    • config
      • sites
        • site1
        • site2
          • extends /modules/extended-templating-kit/config/sites/site1

After upgrade

• modules
  • multisite
    • config
      • sites
        • site1
        • site2
          • extends /modules/extended-templating-kit/config/sites/site1