Fix issue where bootstrap.rb overwrites the level of a BroadcastLogger's broadcasts.

In `bootstrap.rb` we set the `Rails.logger.level` to `config.log_level`. But at this point, we may have already set up a `BroadcastLogger` with multiple broadcasts that have different levels. So, calling `level=` on the `BroadcastLogger` will overwrite the level of the individual broadcasts. So instead, let's only set the `Rails.logger.level` if the logger is not a `BroadcastLogger`.

Author: andrewn617

activesupport/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Fix issue where `bootstrap.rb` overwrites the `level` of a `BroadcastLogger`'s `broadcasts`.
+
+    *Andrew Novoselac*
+
 *   Fix compatibility with the `semantic_logger` gem.
 
     The `semantic_logger` gem doesn't behave exactly like stdlib logger in that

railties/lib/rails/application/bootstrap.rb

@@ -54,9 +54,9 @@ module Bootstrap
           )
           logger
         end
-        Rails.logger.level = ActiveSupport::Logger.const_get(config.log_level.to_s.upcase)
 
         unless Rails.logger.is_a?(ActiveSupport::BroadcastLogger)
+          Rails.logger.level = ActiveSupport::Logger.const_get(config.log_level.to_s.upcase)
           broadcast_logger = ActiveSupport::BroadcastLogger.new(Rails.logger)
           broadcast_logger.formatter = Rails.logger.formatter
           Rails.logger = broadcast_logger