[TEST] use logger level from test class annotation also in external node...

...s


Not necessarily. Test classes can override `externalNodeSettings(int)` and in this case the overriding function would again have to add the logger levels or they will not be picked up. See for example https://github.com/elasticsearch/elasticsearch/blob/master/src/test/java/org/elasticsearch/bwcompat/UnicastBackwardsCompatibilityTest.java#L43
If we were to remove the `externalNodeSettings(int)` method entirely, we would enforce that all external nodes must get the same settings as the upgraded nodes. Not sure if this is desirable.