Function for auth_token middleware config

Each project was configuring the auth_token middleware using several
lines of inisets. Since all the projects should configure the
auth_token middleware in the same way create a function and call it.

Change-Id: I3b6727d5a3bdc0ca600d8faa23bc6db32bb32260
diff --git a/lib/keystone b/lib/keystone
index b6a4e10..2b2f31c 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -386,11 +386,37 @@
 }
 
 # Configure the API version for the OpenStack projects.
-# configure_API_version conf_file version
+# configure_API_version conf_file version [section]
 function configure_API_version {
     local conf_file=$1
     local api_version=$2
-    iniset $conf_file keystone_authtoken auth_uri $KEYSTONE_SERVICE_PROTOCOL://$KEYSTONE_SERVICE_HOST:$KEYSTONE_SERVICE_PORT/v$api_version
+    local section=${3:-keystone_authtoken}
+    iniset $conf_file $section auth_uri $KEYSTONE_SERVICE_PROTOCOL://$KEYSTONE_SERVICE_HOST:$KEYSTONE_SERVICE_PORT/v$api_version
+}
+
+# Configure the service to use the auth token middleware.
+#
+# configure_auth_token_middleware conf_file admin_user signing_dir [section]
+#
+# section defaults to keystone_authtoken, which is where auth_token looks in
+# the .conf file. If the paste config file is used (api-paste.ini) then
+# provide the section name for the auth_token filter.
+function configure_auth_token_middleware {
+    local conf_file=$1
+    local admin_user=$2
+    local signing_dir=$3
+    local section=${4:-keystone_authtoken}
+
+    iniset $conf_file $section auth_host $KEYSTONE_AUTH_HOST
+    iniset $conf_file $section auth_port $KEYSTONE_AUTH_PORT
+    iniset $conf_file $section auth_protocol $KEYSTONE_AUTH_PROTOCOL
+    iniset $conf_file $section identity_uri $KEYSTONE_AUTH_URI
+    iniset $conf_file $section cafile $KEYSTONE_SSL_CA
+    configure_API_version $conf_file $IDENTITY_API_VERSION $section
+    iniset $conf_file $section admin_tenant_name $SERVICE_TENANT_NAME
+    iniset $conf_file $section admin_user $admin_user
+    iniset $conf_file $section admin_password $SERVICE_PASSWORD
+    iniset $conf_file $section signing_dir $signing_dir
 }
 
 # init_keystone() - Initialize databases, etc.