Updated openstack/openstack
Project: openstack/requirements  7e905f3deed7fe3d93dfa3421a3148d1238724e9
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Add openstack-doc-tools

openstack-doc-tools is used in the documentation and api
repositories. Latest release is 0.3.

Add it to global-requirements and add list of repositories using
it to projects.txt.

Change-Id: Id6a79d3596c6cfaab92cfb8fc89d4298db61b7f0