SAMZA-2276: Add Metdata store putAll API#1112

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dnishimura wants to merge 2 commits intoapache:masterfrom

dnishimura:samza-2276-metadata-store-putall-api

Commits on Jul 22, 2019

SAMZA-2271: Add Metdata store putAll API
dnishimura
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Commits on Jul 30, 2019

Update javadoc for MetadataStore#putAll
dnishimura
committed