RHINENG-21445: revert drop of inventory schema

Author: TenSt

database_admin/migrations/147_drop_inventory_schema.down.sql

@@ -0,0 +1 @@
+SELECT 1 FROM inventory.hosts LIMIT 1;

database_admin/migrations/147_drop_inventory_schema.up.sql

@@ -0,0 +1,2 @@
+-- just to trigger the migration
+SELECT 1 FROM inventory.hosts LIMIT 1;

database_admin/migrations/147_trigger_migration.down.sql

@@ -17,8 +17,8 @@ func TestTableSizes(t *testing.T) {
 	for _, item := range tableSizes {
 		uniqueTables[item.Key] = true
 	}
-	assert.Equal(t, 230, len(tableSizes))
-	assert.Equal(t, 230, len(uniqueTables))
+	assert.Equal(t, 231, len(tableSizes))
+	assert.Equal(t, 231, len(uniqueTables))
 	assert.True(t, uniqueTables["public.system_inventory"]) // check whether table names were loaded
 	assert.True(t, uniqueTables["public.system_patch"])     // check whether table names were loaded
 	assert.True(t, uniqueTables["public.package"])