Migration path for dblog 7.x

OK, here's the migration yml and test.

A little cleanup on the test...

I noticed that I wasn't using my self::$modules when enabling the module in setUp(). That's fixed now.

Last time: I realized that I had copied and pasted used bold originality to name my test testBookSettings rather than testDblogSettings, which this patch fixes.

This needs to use a migration template now - see https://www.drupal.org/node/2527568

1. +++ b/core/modules/migrate_drupal/src/Tests/d7/MigrateDblogConfigsTest.php
   @@ -0,0 +1,53 @@
   +  public static $modules = array('dblog');
   

   Can hardly believe you #phenaproxima didn't use the new array syntax ;)

2. +++ b/core/modules/migrate_drupal/src/Tests/d7/MigrateDblogConfigsTest.php
   @@ -0,0 +1,53 @@
   +    $this->installConfig(self::$modules);
   

   static::

assertConfigSchema ? Why does this test do that and no other does ? Do we need to add it to others or do we need to remove from her or is dblog special? I asked alexpott about how much the schema is enforced

The value types are enforced. Tt does not enforce the structure other than throwing an error if something is array and it is not supposed to be - or vice versa

so I do not think we need to assertConfigSchema here.

Looks good.

Migrate is not subject to beta evaluation. Committed 251ca21 and pushed to 8.0.x. Thanks!