lava-network alias-hosts still a bit broken

As you can see here: https://validation.linaro.org/scheduler/job/123860/log_file#L_9_0 (you might need to admin yourself into the leg-verticals group first).

I see three problems:

1) the role name load-gen has somehow become the role aliases -gen01 and -gen02.
2) there is only one server node but its role alias is server02 (I think this is simple: $r needs to be zeroed on each iteration of the loop in lava_multi_node_make_aliased_hosts)
3) the lava/bin/lava-multi-node.lib: line 240: load-gen01=loadgen01: command not found messages