fac2e6a6045e4ddd6b473f4f3ddbb69d9d6921f6 test: Fail early on disconnect in mininode.wait_for_* (MarcoFalke)
Pull request description:
The node might crash or disconnect when our mininode waits for data. Due to the crash, the data is guaranteed to never arrive and we can fail early with an assert
Backport of Core PR16470