FIX: Pubsub connections need to be killed too.

lib/discourse_redis.rb

@@ -32,6 +32,7 @@ class DiscourseRedis
         if slave_client.call([:info]).split("\r\n").include?(MASTER_LINK_STATUS)
           logger.warn "#{log_prefix}: Master server is active, killing all connections to slave..."
           slave_client.call([:client, [:kill, 'type', 'normal']])
+          slave_client.call([:client, [:kill, 'type', 'pubsub']])
           Discourse.clear_readonly!
           Discourse.request_refresh!
           @master = true

spec/components/discourse_redis_spec.rb

@@ -84,6 +84,7 @@ describe DiscourseRedis do
           fallback_handler.master = false
           Redis::Client.any_instance.expects(:call).with([:info]).returns(DiscourseRedis::FallbackHandler::MASTER_LINK_STATUS)
           Redis::Client.any_instance.expects(:call).with([:client, [:kill, 'type', 'normal']])
+          Redis::Client.any_instance.expects(:call).with([:client, [:kill, 'type', 'pubsub']])
 
           fallback_handler.initiate_fallback_to_master