add option to dump mesh information on startup

[tswaters]

The monitoring script is really cool, +1 to that.

However, seems tightly coupled to the option -- and the ability to dump out this table would be quite valuable, without all the extra stdout and keyboard stuff. This could go with an option, dump_mesh so you can clearly see what a given microservice sees when it joins.

I've got a PR for this.... the only thing I wasn't sure on was the sort order. I'm keeping monitor_data which tracks the rem and add totals as a hash, not an array. If something isn't found it is added, so the same behaviour right now where new entries are added to the top is not retained.