Update Storyboard jobs

Update Storyboard jobs to:
* reuse python-jobs template for zuul layout config
* mark python33 job as non-voting for now
  (we didn't have it before, there is a good chance it's broken now)
* gate storyboard on docs
* add a job to publish storyboard docs to
  http://ci.openstack.org/storyboard

Note:
python26 is still marked as non-voting. that is correct.
We can mark it as voting only when Django stuff is removed from
Storyboard. There were cases when Django caused python26 jobs to fail.

Change-Id: I4bef8fb68dafa4da393658f2149d781ff481683f
Merge "Update Storyboard jobs"