collectd: add collectd-write_kafka

write_kafka support was recently added to centos-opstools
collectd build

Change-Id: Ida94d5ee34ecaa06023100d402e9042562d4cf4a

docker/collectd/Dockerfile.j2

@@ -31,6 +31,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
       'collectd-sysevent',
       'collectd-utils',
       'collectd-virt',
+      'collectd-write_kafka',
       'collectd-write_prometheus',
       'python-collectd-gnocchi'
   ] %}