sodonnel opened a new pull request #75: HDDS-2349 QueryNode does not respect 
null values for opState or state
URL: https://github.com/apache/hadoop-ozone/pull/75
 
 
   In HDDS-2197, the queryNode API call was changed to allow operational state 
(in_service, decommissioning etc) to be passed along with the node health 
state. This changed allowed for a null state to indicate a wildcard, so passing:
   
   opState = null
   healthState = HEALTHY
   
   Allows one to find all the healthy nodes, irrespective of their opState.
   
   However, for an enum protobuf field, if no value is specified, the first 
enum in the set is returned as the default. This means that when a null is 
passed for opState, only the IN_SERVICE nodes are returned. Similar for health 
state - passing a null will return only HEALTHY nodes.
   
   This PR will fix this issue so the null value acts as a wildcard as intended.

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