Introduce integration test(s) for network latency and packet loss

[engelmi]

In #652, an issue about BlueChi not being able to detect network issues such as Unreachable Host was raised. This has been fixed in #670.

It would be great to have integration tests to (automatically) validate that the IPReceiveErrors configuration option works as expected - disconnecting the node when network issues arise (such as ICMP packets for unreachable host). Comment #652 (comment) describes an example approach on how to reproduce such a network issue. For automation, network latency and packet drop needs to be simulated, e.g. see
https://dzone.com/articles/simulate-network-latency-and-packet-drop-in-linux