[json status and reporter] Include null fields in serialized JSON #331
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To keep pre-existing behavior that changed with #321.
Apparently
com.fasterxml.jackson.databind.ObjectMapper
used to serialize null fields, whereascom.fasterxml.jackson.jr.ob.JSON
doesn't anymore by default (need to enable this property: http://fasterxml.github.io/jackson-jr/javadoc/2.5/com/fasterxml/jackson/jr/ob/JSON.Feature.html#WRITE_NULL_PROPERTIES).JSONReporter
.Testing: I tested the resulting jar with a local agent, JMXFetch's status still reports fine in the agent's status page.