mgrctl get [object] [name]

[cbosdo]

Add an mgrctl get command with an object type parameter and optionally a name to query the server data.
For instance something like mgrctl get systems would return all the registered systems and mgrctl get systems foo would provide data for the foo registered system.

We could imagine some filtering, paging and output format parameters too.

[mmmmmmpc]

I love thsi one.
Having output in JSON / YAML option would be awesome -o json