Run linters job instead of py27
Run linters job instead of py27

py27 job ignores *.rst files, while the tests it runs actually check
those. Change it to linters instead.

Depends-On: Ib14c2a3318dc171be8c8ed8207524ab9774c5ccd
Change-Id: I49a549d6415b2daf64f0a168be5613788543b28b

openstack-infra/project-config,openstack-infra/project-config