[DO NOT MERGE] ACI: MSI update#766

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iscai-msft wants to merge 2 commits intoAzure:masterfrom

iscai-msft:aci_2018_10_msi_update

Commits on Jun 24, 2019

implemented update, not passing test bc of server side issue
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Commits on Jul 8, 2019

uncommented part of aci test
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