soak client: added DataDog metrics agent, and some refactoring.

Author: edenhill

tests/soak/README.md

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+# Soak testing client
+
+The soak testing clients should be run for prolonged periods
+of time, typically 2+ weeks, to vet out any resource leaks, etc.
+
+The soak testing client is made up of a producer, producing messages to
+the configured topic, and a consumer, consuming the same messages back.
+
+DataDog reporting supported by setting datadog.api_key a and datadog.app_key
+in the soak client configuration file.
+
+
+Use ubuntu-bootstrap.sh in this directory set up the environment (e.g., on ec2).

tests/soak/requirements.txt

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+datadog