HDDS-2199 In SCMNodeManager dnsToUuidMap cannot track multiple DNs on the same host#1551

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sodonnel wants to merge 10 commits intoapache:trunkfrom

sodonnel:HDDS-2199-dnsToUuidMap

Commits on Oct 2, 2019

Changed SCMNodeManager.getNodeByAddress to returns a list of nodes on the given host / address rather than a single node
S O'Donnell
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Fixed style issue
S O'Donnell
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Make addEntryTodnsToUuidMap synchronized
S O'Donnell
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Added findbugs ignore annotation
S O'Donnell
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Moved HashSet to a Concurrent version and ensured the MockNodeManager is also synchronized when modifying dnsToUuidMap
S O'Donnell
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Fixed further style issues
S O'Donnell
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Refactored the the change in sortDatanodes() to make it simpler and remove the random lookup
S O'Donnell
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Fixed another style issue (unused import) after removing the random logic
S O'Donnell
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Commits on Oct 3, 2019

Simplify logic used to map Client host string to a DatanodeDetails object
S O'Donnell
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Remove unused import
S O'Donnell
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