Remove left over reference to admin endpoint
Remove left over reference to admin endpoint

This CR removes a missed reference to the admin endpoint that was missed
when the admin endpoint was removed.

Change-Id: I3917acf5541c9ea43dcf895c6a85b97a1f9259bc
Related-Bug: #1450277

openstack/barbican,cloudkeep/barbican,MCDong/barbican,cneill/barbican,cloudkeep/barbican,MCDong/barbican,openstack/barbican,cneill/barbican