Make arcstat output in JSON. BUGZ-3667
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This merge request is automatically copied from !739 (merged) orginally made by @aleksandr.konstantinov
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Adding possibility to output arcstat information in JSON format.
Begin arcbot message
This merge request is automatically copied from !739 (merged) orginally made by @aleksandr.konstantinov
End arcbot message
Adding possibility to output arcstat information in JSON format.