Updated openstack/openstack
Project: openstack/sahara  928a02f3ae938e1a9f7ff3e395054a98e235f225

[DOC] Removed feature matrix for heat engine

There is a feature parity between heat and direct engines. There is
no need in feature matrix.

Change-Id: Id12d9e8eace33f64783f0e5f4c755df3f9bf38e7