gnosis / dex-services / 4641

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travis-pro

Shared logger in price estimator. (#1283)

Fixes #1280 

Used the shared logging component.

### Test Plan

Run the price estimator and see logs:
```
$ cargo run -p price-estimator -- --orderbook-file target/orderbook-file-mainnet                                                  
    Finished dev [unoptimized + debuginfo] target(s) in 0.14s
     Running `target/debug/price-estimator --orderbook-file target/orderbook-file-mainnet`
2020-08-10T16:03:42.612Z INFO [price_estimator] Starting price estimator with runtime options: Options {
...
```

11929 of 47566 branches covered (25.08%)

Branch coverage included in aggregate %.

3250 of 5123 relevant lines covered (63.44%)

28224.47 hits per line