I found out:
1) os-security-group-rules is not documented on either v2 nor v2.1
Nova api-site.
2) os-security-group-rules only has Create (POST) and Delete
(DELETE) methods.
This patch adds a description about os-security-group-rules (Create
and Delete) to both v2 and v2.1 api-sites.
Change-Id: I0fef6b00a13b615b5c37f9c41cd30711e0bc0029
Closes-Bug: #1393804
f6d3ae4d6a