Test that we are connected to local root peers

[coot]

Note that we might not be connected at some periods of time due to attenuation
or the fact that the node is not running. The property should be able to be
expressed as a best effort / progress property.

We should be able to elevate a governor test to achieve the goal. See:

• prop_governor_target_established_local
• prop_governor_target_active_local_below
• prop_governor_target_active_local_above