Allow to run with API v3 (remove deprecated options)

Remove the usage of api_version and let the library
code use catalog_type instead.
CONF.volume_feature_enabled.{api_v2,api_v3} have been deprecated
since rocky.

See also:
- https://review.opendev.org/#/c/698754/
- https://review.opendev.org/#/c/698757/
and other reviews.

Change-Id: Ic91f38ebff96df7d38a2d8cd2447e454c385c46c
1 file changed