Remove Kafka partitions config option

This option doesn't actually do anything and a bug to remove
it from the Monasca API config file has been raised.

Partially-Implements: blueprint monasca-roles
Change-Id: I7ec1786b5828ab0135ca86ec040f83a6f4c78d9f

ansible/roles/monasca/templates/monasca-api/api.conf.j2

@@ -15,7 +15,6 @@ port = {{ monasca_influxdb_http_port }}
 
 [kafka]
 metrics_topic = {{ monasca_metrics_topic }}
-partitions = 0
 uri = {{ monasca_kafka_servers }}
 
 [messaging]