[CURATOR-470] Add new service cache listener to let users know what instances have changed#268

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Randgalt wants to merge 4 commits intomasterfrom

Commits on Jun 8, 2018

Add new service cache listener to let users know what instances have changed, while preserving backward compatibility.
JerryChin
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Commits on Jun 24, 2018

Merge branch 'CURATOR-470' of github.com:JerryChin/curator into CURATOR-470
randgalt
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wip
randgalt
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CURATOR-470
randgalt
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