NSQ Output plugin

NSQ output plugin, following the NSQ methodology output is a producer
to one instance of NSQD. The go library does not accept array values be
default for a Producer. Additionally service discovery is generally
done as a consumer.

Follows same methodology as Kafka Output without the tag reference.

scripts/docker-compose.yml

@@ -47,3 +47,9 @@ aerospike:
     image: aerospike/aerospike-server
     ports:
         - "3000:3000"
+
+nsq:
+    image: nsqio/nsq
+    ports:
+        - "4150:4150"
+        - "4151:4151"