Split farm_migrate_user and farm_migrate_role out to their own migration groups.

This allows contrib modules to provide their own role migrations by replicating the farm_migrate_role config.

docs/hosting/migration.md

@@ -28,6 +28,8 @@ Follow the steps below to migrate your farmOS 1.x data to farmOS 2.x:
 6. Run the farmOS 1.x Migrations via Drush (in this order):
 
         drush migrate:import --group=farm_migrate
+        drush migrate:import --group=farm_migrate_role
+        drush migrate:import --group=farm_migrate_user
         drush migrate:import --group=farm_migrate_taxonomy
         drush migrate:import --group=farm_migrate_asset
         drush migrate:import --group=farm_migrate_area

modules/core/migrate/config/install/migrate_plus.migration.farm_migrate_role.yml

@@ -6,7 +6,7 @@ dependencies:
       - farm_migrate
 id: farm_migrate_role
 label: 'Roles'
-migration_group: farm_migrate
+migration_group: farm_migrate_role
 migration_tags:
   - 'Drupal 7'
   - 'farmOS 1.x'

modules/core/migrate/config/install/migrate_plus.migration.farm_migrate_user.yml

@@ -6,7 +6,7 @@ dependencies:
       - farm_migrate
 id: farm_migrate_user
 label: 'User accounts'
-migration_group: farm_migrate
+migration_group: farm_migrate_user
 migration_tags:
   - 'Drupal 7'
   - 'farmOS 1.x'
@@ -61,12 +61,11 @@ process:
     plugin: get
     source: init
   roles:
-    plugin: migration_lookup
-    migration: farm_migrate_role
+    plugin: farm_migration_group_lookup
+    migration_group: farm_migrate_role
     source: roles
     no_stub: true
 migration_dependencies:
-  required:
-    - farm_migrate_role
+  required: {  }
   optional:
     - farm_migrate_system_date

modules/core/migrate/config/install/migrate_plus.migration_group.farm_migrate_role.yml

@@ -0,0 +1,12 @@
+langcode: en
+status: true
+dependencies:
+  enforced:
+    module:
+      - farm_migrate
+id: farm_migrate_role
+label: 'farmOS 1.x Role Migration'
+description: 'Migrates roles from farmOS 1.x to farmOS 2.x'
+source_type: 'farmOS 1.x'
+module: null
+shared_configuration: null

modules/core/migrate/config/install/migrate_plus.migration_group.farm_migrate_user.yml

@@ -0,0 +1,12 @@
+langcode: en
+status: true
+dependencies:
+  enforced:
+    module:
+      - farm_migrate
+id: farm_migrate_user
+label: 'farmOS 1.x User Migration'
+description: 'Migrates users from farmOS 1.x to farmOS 2.x'
+source_type: 'farmOS 1.x'
+module: null
+shared_configuration: null