Remove deprecated Keystone middleware: RAX-KSKEY

It is no longer supported and will fail in the Essex release

Change-Id: I6520149f1ecbe4966c786af40db987557d9101f6
diff --git a/files/keystone.conf b/files/keystone.conf
index 0c0d0e2..a646513 100644
--- a/files/keystone.conf
+++ b/files/keystone.conf
@@ -94,7 +94,6 @@
 pipeline =
     urlrewritefilter
     legacy_auth
-    RAX-KEY-extension
     service_api
 
 [app:service_api]
@@ -109,8 +108,5 @@
 [filter:legacy_auth]
 paste.filter_factory = keystone.frontends.legacy_token_auth:filter_factory
 
-[filter:RAX-KEY-extension]
-paste.filter_factory = keystone.contrib.extensions.service.raxkey.frontend:filter_factory
-
 [filter:debug]
 paste.filter_factory = keystone.common.wsgi:debug_filter_factory