Add account-level connection stats

[bruth]

trafficstars

This adds tracking of msgs and bytes for route, gateway, and leaf connections.

More tests need to be added, but I wanted to get a proposal of the idea prepared for initial review in case there are any glaring issues.

Signed-off-by: Byron Ruth [email protected]

[bruth]

I will fix the test.. it is an existing one that is doing a contains string match for the existing accstatz payload.