Bug 865391 - Intermittent Jetpack TEST-UNEXPECTED-FAIL | unknown | Test output exceeded timeout (60s)

Increased the timeout from 1 minute to 5 minutes - hoping it would be enough
Merge pull request #1162 from ZER0/runner-fail/865391

Bug 865391 - Intermittent Jetpack TEST-UNEXPECTED-FAIL | unknown | Test ... r=@Mossop