use resdis configuration for activity log

app/lib/activity_log_publisher.rb

@@ -1,7 +1,7 @@
 class ActivityLogPublisher
 
   def initialize
-    @redis = Redis.new
+    @redis = RedisConfiguration.new.connection
   end
 
   def publish(log_event)

lib/activity_log_subscriber.rb

@@ -3,7 +3,7 @@ require 'redis'
 
 class ActivityLogSubscriber
   def start
-    redis = Redis.new
+    redis = RedisConfiguration.new.connection
 
     redis.subscribe('activity_log') do |on|
       on.message do |channel, message|