This is a work to switch OSC from using glanceclient to OpenStackSDK.
With this change only v2 is using OpenStackSDK. V1 is still using
glanceclient and will be switched in a separate change.
Remove the direct depend on keystoneauth- let that flow through
openstacksdk.
Depends-on: https://review.opendev.org/#/c/698972
Change-Id: I36f292fb70c98f6e558f58be55d533d979c47ca7