Support for Multiple ActiveGates

[m3tomlins]

We have a situation where we are required to operate Monaco from within a secured environment where the Monaco client is connecting to the DT tenant via an array of multiple ActivateGates in the same ActiveGate group with the same Network Zone.

We would like the Monaco client to operate similar to the OneAgent (e.g. --set-server xxx) where the client can initiate traffic through the first ActiveGate and if that fails, it would try the second ActiveGate and then if all AG's were unavailable, try the open internet connection to the DT tenant.

Of course, we could implement our own internal load balancer for this, but it seems natural to find a similar functionality to the OneAgent connectivity via multiple ActiveGates.