Updated openstack/openstack
Project: openstack/horizon  5c6ca40b3c3cec88b24ffed4683d60f96944ddb2
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Switch over to oslosphinx

oslosphinx is the new name of oslo.sphinx

Closes-Bug: #1277168
Change-Id: I4cebcffb36724d699147a26eb1132b122cfe669c