Bruno Škvorc e69702bab5 Use environment variables (#176)
Passing along no-name command line arguments when using make (from Nimbus) would need make target revamps that are a bit clumsy AFAIK, so using environment variables in the spirit of USE_MULTITAIL to get the number of validators and nodes makes more sense to me.

This lets us run the sim from nim-beacon-chain with

```bash
VALIDATORS=512 NODES=100 USE_MULTITAIL="yes" tests/simulation/start.sh
```

and from Nimbus with:

```bash
VALIDATORS=512 NODES=100 USE_MULTITAIL="yes" make eth2_network_simulation
```

Also makes for a more verbose launch process.
2019-03-13 06:44:30 -06:00
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2019-03-13 06:44:30 -06:00