run-vmtest: Allow specifying cpu and memory for vms #206
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The max-cpu parameter is currently unused by the script and therefore vmtest defaults to 2 CPU. There is not parameter available to specify the amount of memory to give to the vm, for this the vmtest defaults to 4G.
These low defaults(specifically the memory) sometimes cause the bpf seltests to sporadically fail. So, add the option to specify memory and also start using the max-cpu parameter with vmtest.