a92e48b02d test: move TEST_RUNNER_EXTRA into native tsan setup (fanquake)
Pull request description:
`feature_block.py` is being run in the tsan job, i.e [here](https://travis-ci.org/github/bitcoin/bitcoin/jobs/703122309), even though it should be excluded. My hasty assumption is that this will fix it. In any case, all other instances of `TEST_RUNNER_EXTRA` seem to have moved out of `.travis.yml` and into the different CI configurations.
ACKs for top commit:
MarcoFalke:
ACK a92e48b02d
practicalswift:
ACK a92e48b02d -- patch looks correct
hebasto:
ACK a92e48b02d, I have reviewed the code and it looks OK, I agree it can be merged.
Tree-SHA512: 86057bef2cc87c6acdbbf94f8cd7a5147510448c3e67aacde8daf247e3ccf649cfc5afbbd10693e084f426042d98150616c0e49bfa5f32b949dff9cebd2fd95d