MINIFICPP-2739 Add test scenario info to behave logs

[lordgamez]

Behave only starts log capture after before_scenario hook is finished, so any log entries especially scenario information are lost. Add scenario information as a separate file next to the scenario.log file to be able to identify which test scenario the log file belongs to.

https://issues.apache.org/jira/browse/MINIFICPP-2739

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