Fix admin version pipeline.

 * ala https://review.openstack.org/#change,4282

Change-Id: I1cb3ad4b3ff2c8f339c18db15e44a862bbc07282
diff --git a/files/keystone.conf b/files/keystone.conf
index 45044f7..b26e70d 100644
--- a/files/keystone.conf
+++ b/files/keystone.conf
@@ -89,4 +89,4 @@
 [composite:admin]
 use = egg:Paste#urlmap
 /v2.0 = admin_api
-/ = admin_version_service
+/ = admin_version_api