Updated openstack/openstack
Project: openstack/keystone  0e9aefe73baf06997067e06f2485b883a1c29e6c

Remove unused ec2 driver option

Remove the unused ec2 driver option from the config. This option
is unused since the credential backend is used for the ec2 contrib
extension.

Change-Id: I5385a086210e415a14b0ed1605c9ded50a280ad2