This patch updates the devstack plugin to use a dual Certificate
Authority (CA) with intermediate CAs for the Octavia controller
deployment.
This is a more realistic deployment model for testing.
Note: This change uses weak security to save gate resources. Please
refer to the Octavia Certificate Configuration Guide for production
instructions.
Change-Id: I3ec135766c9a1ddb7ac6655c0ee1ccb1e78ead5c
950faea6e9