[qa] p2p-versionbits-warning.py fails occasionally #12259
Description
To keep track of p2p-versionbits-warning.py intermittent travis failure logs:
Example backtrace:
2018-01-24 12:50:32.849000 TestFramework (ERROR): Assertion failed
Traceback (most recent call last):
File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/test_framework/test_framework.py", line 123, in main
self.run_test()
File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/p2p-versionbits-warning.py", line 112, in run_test
assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getmininginfo()["warnings"])
AssertionError