MM-10121: CLI command to reset permissions system to default state. (#8637)

* MM-10121: CLI command to reset permissions system to default state.

* Review comment.

store/sqlstore/role_supplier.go

@@ -174,3 +174,13 @@ func (s *SqlSupplier) RoleGetByNames(ctx context.Context, names []string, hints
 
 	return result
 }
+
+func (s *SqlSupplier) RolePermanentDeleteAll(ctx context.Context, hints ...store.LayeredStoreHint) *store.LayeredStoreSupplierResult {
+	result := store.NewSupplierResult()
+
+	if _, err := s.GetMaster().Exec("DELETE FROM Roles"); err != nil {
+		result.Err = model.NewAppError("SqlRoleStore.PermanentDeleteAll", "store.sql_role.permanent_delete_all.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	return result
+}

store/sqlstore/system_store.go

@@ -85,3 +85,14 @@ func (s SqlSystemStore) GetByName(name string) store.StoreChannel {
 		result.Data = &system
 	})
 }
+
+func (s SqlSystemStore) PermanentDeleteByName(name string) store.StoreChannel {
+	return store.Do(func(result *store.StoreResult) {
+		var system model.System
+		if _, err := s.GetReplica().Exec("DELETE FROM Systems WHERE Name = :Name", map[string]interface{}{"Name": name}); err != nil {
+			result.Err = model.NewAppError("SqlSystemStore.PermanentDeleteByName", "store.sql_system.permanent_delete_by_name.app_error", nil, "", http.StatusInternalServerError)
+		}
+
+		result.Data = &system
+	})
+}