[202012] [portstat pfcstat] Unify the packet number format in the output of portstat and pfcstat in all cases #1795
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What I did
backport #1755 to 202012 branch
How I did it
Add a new function format_number_with_comma to format the packet numbers with comma, this function will be called in case ns_diff is not applicable.
Update the unitest to cover this new change.
How to verify it
execute portstat and pfcstat to check the output whether the number format is expected.
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)