Fix node name and port in diagnostic_remote_logging README (backport #515)

[mergify]

There are some issues in the README, it took me some time to set everything up (in the end it worked fine!)

• the node name is different, resulting in the parameter yaml not being used
• yaml syntax forbids keys without values
• the telegraf input listener needs a different port if the influxdb still uses the default 8086

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  This is an automatic backport of pull request Fix node name and port in diagnostic_remote_logging README #515 done by Mergify.