Currently in the keystone API documentation page located at,
https://developer.openstack.org/api-ref/identity/index.html
all the sections and sub-sections appear at the same depth.
This makes the ordering very untidy and confusing.
This patch reorganises the appearance of sections and
sub-sections at the index page.
Change-Id: I55ae0102236805591e653c153618dec2af510c63
currntly, no index.html file is generated for any of the APIs,
which should be required to migrate over to the api-site.
check the generated build.
Change-Id: Ib290c7412ff426b3061c5ad7535c8cb8310500fa