swift auth opts to be removed from glance store code

[Dharini Chandrasekar]

NOTE: not sure there's anything to be done on the glance side (other than regenerating the config files). These options have been deprecated for a long time, it's time to remove them.

The following opts were deprecated in favor of reading swift params from the file set with swift_store_config_file: [1]

swift_store_auth_version
swift_store_auth_address
swift_store_user
swift_store_key

These opts to need to be removed and the required swift params need to be read from the swift store config file.
This is is the desired behaviour for both swift single tenant and swift multi tenant mode where the user has to set default_swift_reference accordingly.

[1] https://github.com/openstack/glance_store/blob/2612aac2974d08214cdb1ea0d9a806cfb829adfc/glance_store/_drivers/swift/utils.py#L44-L75