Feature: Mention examining the log file as a next step on E2E test failure

[alexnj]

Currently the E2E CLI does not offer much as a next step during a failure scenario. The log file name is stated upfront on initialization, but it's a hard to miss detail if one doesn't know what they are looking for.

I think we could improve this for the novice user by adding an additional line post failure recognition, something like: Additional information might be available in <logfile>.

[OrKoN]

cc @Lightning00Blade