[api] Document implied roles

[Steve Martinelli]

The following are missing from the new API site:

  - http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#create-role-inference-rule
  - http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#get-role-inference-rule
  - http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#confirm-a-role-inference-rule
  - http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#delete-role-inference-rule
  - http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#list-implied-roles-for-role
  - http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#list-all-role-inference-rules

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/355219

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/355219
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=3b86db443cc7f4b360e434a6a804df20d1756425
Submitter: Jenkins
Branch: master

commit 3b86db443cc7f4b360e434a6a804df20d1756425
Author: Tin Lam <email address hidden>
Date: Sat Aug 13 20:41:07 2016 -0500

    api-ref: Document implied roles API

    Add documentation for implied roles.

    Change-Id: I9fe9123acc8a83379c8dbe02a8fe517add0d8c67
    Closes-Bug: #1609164

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/keystone 10.0.0.0b3 development milestone.