FullSlots BackendEndpoint is incorrect

[EmpireJones]

I believe in stats_socket.go:201 BackendEndpoint is getting a local memory address for endpoint, which is re-used for each iteration of the loop, meaning that all of the BackendEndpoints in FullSlots are set to the last of the list of endpoints:

// use addr:port as BackendServerName, don't generate empty slots
for _, endpoint := range updBackendsMap[backendName].Endpoints {
	target := fmt.Sprintf("%s:%s", endpoint.Address, endpoint.Port)
	newBackend.FullSlots[target] = types.HAProxyBackendSlot{
		BackendServerName: target,
		BackendEndpoint:   &endpoint,
	}
}

To fix this, you should be able to make a local copy of the object, and then take the address of that.

[jcmoraisjr]

Fixed on #85