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travis-pro

Fix how min average fee is passed to solver (#1253)

Solver expects total amount of paid fee while we were passing *earned*
fees, which is half of the total. This lead to many solutions failing
with benign error: max gas price lower than fast price.

See https://github.com/gnosis/dex-open-solver/blob/593d20225/src/match.py#L49.
I found this through checking a recent solution and seeing that the fee in the solution.json was double than what we printed in the logs and that the min-avg-fee-per-order was only upheld assuming the doubled fee.

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