Add LoadLegacy testing for e2e package

e2e/legacyEkv/.ekv.1

e2e/legacyEkv/.ekv.2

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...87431fdd696ed21237700a06cde8f7eb1de1dfbf74e14aec8e631eb.2

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...9d7519573265a39fe50badb54f8782b6966ec97719330a7f0d69548.2

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...7b1daa9381d74757551fe8d679d74cb7f60b9d93d34d4e721a6d29b.2

...8885b838d5699da529a9ef8100a646ca97724894831f05a70188876.1