Make pytest verbose and print full stack traces on errors (#5537)
Make pytest verbose and print full stack traces on errors (#5537)

It is convenient to have more information when trying to understand
why SI tests fail by reading console output in Jenkins.
janisz/marathon,meln1k/marathon,mesosphere/marathon,janisz/marathon,guenter/marathon,meln1k/marathon,gsantovena/marathon,mesosphere/marathon,meln1k/marathon,mesosphere/marathon,gsantovena/marathon,gsantovena/marathon,guenter/marathon,mesosphere/marathon,guenter/marathon,guenter/marathon,guenter/marathon,gsantovena/marathon,janisz/marathon,janisz/marathon,mesosphere/marathon,meln1k/marathon,meln1k/marathon,janisz/marathon,gsantovena/marathon