Adjust test in salt file to use boolean value

docs/getting-started-guides/logging.md

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+## Logging
+
+**Experimental work in progress.**
+
+### Logging with Fluentd and Elastiscsearch
+
+To enable logging of the stdout and stderr output of every Docker container in
+a Kubernetes cluster set the shell environment
+variable ``FLUENTD_ELASTICSEARCH`` to ``true`` e.g. in bash:
+```
+export FLUENTD_ELASTICSEARCH=true
+```
+This will instantiate a [Fluentd](http://www.fluentd.org/) instance on each node which will
+collect all the Dcoker container log files. The collected logs will
+be targetted at an [Elasticsearch](http://www.elasticsearch.org/) instance assumed to be running on the
+local node and accepting log information on port 9200. This can be accomplished
+by writing a pod specification and service sepecificaiton to define an
+Elasticsearch service (more informaiton to follow shortly in the contrib directory).