gnosis / dex-services / 5325

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travis-pro

Give more control over economic viability computation (#1480)

Instead of storing an EconomicViabilityComputing in
OptimizationPriceFinder we pass the min_avg_fee directly in the
find_prices method.
This makes the price finding code simpler because it has to access one
les external interface and gives us more control over the economic
viability strategy in StableXDriver.
I plan on making use of to implement a new economic viability strategy
which is a mix of dynamic and static.

Related to #1479 

### Test Plan
Existing tests, no logic change

13319 of 54288 branches covered (24.53%)

Branch coverage included in aggregate %.

3483 of 5442 relevant lines covered (64.0%)

43505.56 hits per line