Merge branch 'jh/json-writer'

Preparatory code to later add json output for telemetry data. * jh/json-writer: json_writer: new routines to create JSON data

Junio C Hamano committed Aug 15, 2018 at 15:08 UTC a14a9bfc132f8fe80cca33d14b1acbcda945de13

No changes.