gnosis / dex-services / 4665

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travis-pro

Use new rounding buffer in estimate_buy_amount route (#1261)

Finally :)

### Test Plan
Run the price estimator from master, the price estimator from this PR and the price estimator from master with rounding-buffer-factor set to 0.0. Compare results. We see that in the estimate-buy-amount route the buy amount is the lowest for the master price estimator which is lower than the this PR's default price estimator which is lower than this PR's price estimator with no rounding buffer. Example:

```
# No rounding buffer
curl "localhost:8082/api/v1/markets/4-7/estimated-buy-amount/1?atoms=false"
{"baseTokenId":4,"quoteTokenId":7,"buyAmountInBase":"1.010907","sellAmountInQuote":"1"}
# Solver based rounding buffer
curl "localhost:8080/api/v1/markets/4-7/estimated-buy-amount/1?atoms=false"
{"baseTokenId":4,"quoteTokenId":7,"buyAmountInBase":"1.010707","sellAmountInQuote":"1"}
# Old rounding buffer
curl "localhost:8081/api/v1/markets/4-7/estimated-buy-amount/1?atoms=false"
{"baseTokenId":4,"quoteTokenId":7,"buyAmountInBase":"1.009896","sellAmountInQuote":"1"}
```

Also checked that /markets route is still the same.

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