Don't pass argument sqlite_db in method set_defaults
Don't pass argument sqlite_db in method set_defaults

Config option sqlite_db is deprecated for removal[1], and isn't used
in both oslo.db and ec2-api, so don't need set its default value.

[1]https://github.com/openstack/oslo.db/blob/0a1bae/oslo_db/options.py#L17

Change-Id: I36d643edd29f5db4907ef842b22d33625a6804d3

openstack/ec2-api,openstack/ec2-api,stackforge/ec2-api,stackforge/ec2-api