Logged stats show incorrect failure percentage

[zachpmartin]

Description of issue

The failure percentage stats printed to stdout are calculated incorrectly.
Seen here
fail_percent = (self.num_failures/float(self.num_requests + self.num_failures))*100

Expected behavior

If something fails every request made, the failure percentage should show 100%.
The calculation should be
fail_percent = float(self.num_failures/self.num_requests)*100

Actual behavior

It shows 50% if a request fails every attempt.

Environment settings

• OS: Fedora 29
• Python version: 3.6.8
• Locust version: latest source

Steps to reproduce (for bug reports)

Create a locust file with any failing requests. You can see the number of failures don't match up with the failure percentage.

[zachpmartin]

Fixed in: 7ce7ca5