[VOQ] 'portstat -j' generates invalid output

[ysmanman]

Description

We observed this issue in T2 testing with recent 202205 image.

portstat -j produced the following line that is not able parsed by json.

Reminder: Please execute 'show interface counters -d all' to include internal links

This seems a regression from sonic-net/sonic-utilities#2851. The offending line is https://github.com/sonic-net/sonic-utilities/blob/dbcaaf8aa27b37dfba1b088e2fa59fd94b8dc683/scripts/portstat#L341

if multi_asic.is_multi_asic() or device_info.is_chassis() and not use_json:

With the above condition, Reminder: Please execute 'show interface counters -d all' to include internal links is printed even when use_json is True.

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[ysmanman]

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