Create a system_logging migration

System logging migration to port the error_level variable into config.

Kudos for PI as patch size!

Looks good to me. Very straight-forward and nothing complicated here.

-mike

+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateSystemLoggingTest.php
@@ -0,0 +1,51 @@
+  public function testSystemLogging() {
+    $config = \Drupal::config('system.logging');
+    $this->assertIdentical($config->get('error_level'), 'some');
+  }

We can now assert the config schema is correct. See #2293419: Add config schema test to all configuration test in migration, fix bugs

assertConfigSchema test added.

Thanks,
-mike

Good catch, fix looks good.

Committed 421123a and pushed to 8.x. Thanks!