[202205] 'portstat -j' avoid non json output for multi-asic/chassis duts

[wenyiz2021]

What I did

This is cherry pick of: #2874
ADO: https://msazure.visualstudio.com/One/_workitems/edit/24260584
fix issue: sonic-net/sonic-buildimage#15439

How I did it

How to verify it

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

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