ovs_performance: Do not clear flows on warmup failure
ovs_performance: Do not clear flows on warmup failure

Do not stop the VM or clear the already learned flows when the
--warm-up-no-fail option is supplied on time out. This allows doing
some warm up for example when the --flow-rule-type is NORMAL.

TODO: The warm-up option is not working as it should be in the PV
case. This needs fixing!

chaudron/ovs_perf,chaudron/ovs_perf