Migrate rds_subnet_group* modules and tests (ansible-collections#1532)

Migrate rds_subnet_group* modules and tests

Depends-On: ansible-collections#1058
Remove rds_subnet_group* modules and tests
These modules have been migrated to amazon.aws
Update runtime.yml with redirects to that collection
Update ignore files

Reviewed-by: Mark Chappell <None>

changelogs/fragments/migrate_rds_subnet_group.yml

@@ -0,0 +1,4 @@
+breaking_changes:
+- rds_subnet_group - The module has been migrated from the ``community.aws`` collection.
+  Playbooks using the Fully Qualified Collection Name for this module should be updated
+  to use ``amazon.aws.rds_subnet_group``.

meta/runtime.yml

@@ -191,7 +191,6 @@ action_groups:
   - rds_option_group
   - rds_option_group_info
   - rds_param_group
-  - rds_subnet_group
   - redshift
   - redshift_cross_region_snapshots
   - redshift_info
@@ -465,6 +464,10 @@ plugin_routing:
       redirect: amazon.aws.iam_policy
     iam_policy_info:
       redirect: amazon.aws.iam_policy_info
+    kms_key:
+      redirect: amazon.aws.kms_key
+    kms_key_info:
+      redirect: amazon.aws.kms_key_info
     rds_cluster:
       redirect: amazon.aws.rds_cluster
     rds_cluster_info:
@@ -479,7 +482,5 @@ plugin_routing:
       redirect: amazon.aws.rds_instance_snapshot
     rds_snapshot_info:
       redirect: amazon.aws.rds_snapshot_info
-    kms_key:
-      redirect: amazon.aws.kms_key
-    kms_key_info:
-      redirect: amazon.aws.kms_key_info
+    rds_subnet_group:
+      redirect: amazon.aws.rds_subnet_group