Updated openstack/openstack
Project: openstack/oslo.concurrency  fa52a63e4f972294fd41321b5ce0fe581a3cc03d

Only modify autoindex.rst if it exists

This fixes doc build errors when using older Sphinx versions.

Change-Id: I0ed9bed311d6309257c0a111671d0fea46f5da7c
Closes-bug: #1387343