Filter airbrake parameters

As Rails does with the application log and other tools. We
are going to use the same filtering rules we use in Consul Democracy.

We are renaming the initializer file name `filter_parameter_logging.rb` so
it's loaded before the errbit initializer.

config/initializers/errbit.rb

@@ -16,6 +16,8 @@ Airbrake.configure do |config|
   config.job_stats = false
   config.query_stats = false
   config.remote_config = false
+
+  config.blocklist_keys = Rails.application.config.filter_parameters
 end
 
 Airbrake.add_filter do |notice|

spec/airbrake_spec.rb

@@ -0,0 +1,7 @@
+require "rails_helper"
+
+describe "Airbrake" do
+  it "uses the same filtering rules that Consul Democracy" do
+    expect(Airbrake::Config.instance.blocklist_keys).to eq Rails.application.config.filter_parameters
+  end
+end