Fix URLs for pep8, and unit tests jobs

Fix URLs for pep8, and unit tests jobs

We switched to constrained jobs a while back, but these links were
showing the non constrained ones, making these graphs useless.

This patch updates them to reflect the jobs that are currently
running, however the docs job is left for later as right now
switching would make graphite fail with:

'TypeError: reduce() of empty sequence with no initial value'

I suspect that's because the job has never failed so far.

Change-Id: I60cab40f3c12099d8437616d8301aecd858ef54c