Ian Wienand a6c2fb53e7 Use zuul-sphinx README.rst detection
With the dependent change, zuul-sphinx will raise a warning when the
autoroles matcher finds a role without a README.rst.  Since we
error-on-warnings this will stop the docs build.  Thus we don't need
this explicit linters check.

Change-Id: I02eefce2448152505bacba3b2a12021515b4a31a
Depends-On: https://review.openstack.org/596014
2018-08-24 17:59:28 +10:00
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