This patch changes some of the alias names to be compatible with v2.
so the extension info output will be as same with v2.
consoles -> os-consoles
flavor-extra-specs -> os-flavor-extra-specs
flavor-manage -> os-flavor-manage
Partially implements blueprint v2-on-v3-api
Change-Id: Ia8c6a0144e43134667636db9ba862b26f265a433