Move IDataView into Microsoft.ML namespace#2987

Merged

eerhardt merged 2 commits intodotnet:masterfrom eerhardt:DataViewNamespace

Mar 18, 2019

Commits on Mar 15, 2019

Move IDataView into Microsoft.ML namespace
eerhardt
committed

Commits on Mar 16, 2019

Fix code analyzer test now that we removed a using line.
eerhardt
committed