Remove neutron ryu-plugin support

Ryu plugin was marked deprecated in Juno and will be removed for Kilo.

We (Ryu team) recommend users to migrate to ofagent, on which
we aim to concentrate our development resources by this deprecation.

Partial-Bug: #1391714
Change-Id: I1ef28818e9400664ae3d83758dc2dcf71c02f185
diff --git a/lib/neutron_thirdparty/ryu b/lib/neutron_thirdparty/ryu
index 233f3aa..eaf088b 100644
--- a/lib/neutron_thirdparty/ryu
+++ b/lib/neutron_thirdparty/ryu
@@ -1,56 +1,15 @@
-# Ryu OpenFlow Controller
-# -----------------------
+# Ryu SDN Framework
+# -----------------
+
+# Used by ofagent.
+# TODO(yamamoto): Switch to pip_install once the development was settled
 
 # Save trace setting
 RYU3_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
-
 RYU_DIR=$DEST/ryu
-# Ryu API Host
-RYU_API_HOST=${RYU_API_HOST:-127.0.0.1}
-# Ryu API Port
-RYU_API_PORT=${RYU_API_PORT:-8080}
-# Ryu OFP Host
-RYU_OFP_HOST=${RYU_OFP_HOST:-127.0.0.1}
-# Ryu OFP Port
-RYU_OFP_PORT=${RYU_OFP_PORT:-6633}
-# Ryu Applications
-RYU_APPS=${RYU_APPS:-ryu.app.simple_isolation,ryu.app.rest}
 
-function configure_ryu {
-    :
-}
-
-function init_ryu {
-    RYU_CONF_DIR=/etc/ryu
-    if [[ ! -d $RYU_CONF_DIR ]]; then
-        sudo mkdir -p $RYU_CONF_DIR
-    fi
-    sudo chown $STACK_USER $RYU_CONF_DIR
-    RYU_CONF=$RYU_CONF_DIR/ryu.conf
-    sudo rm -rf $RYU_CONF
-
-    # Ryu configuration
-    RYU_CONF_CONTENTS=${RYU_CONF_CONTENTS:-"[DEFAULT]
-app_lists=$RYU_APPS
-wsapi_host=$RYU_API_HOST
-wsapi_port=$RYU_API_PORT
-ofp_listen_host=$RYU_OFP_HOST
-ofp_tcp_listen_port=$RYU_OFP_PORT
-neutron_url=http://$Q_HOST:$Q_PORT
-neutron_admin_username=$Q_ADMIN_USERNAME
-neutron_admin_password=$SERVICE_PASSWORD
-neutron_admin_tenant_name=$SERVICE_TENANT_NAME
-neutron_admin_auth_url=$KEYSTONE_SERVICE_PROTOCOL://$KEYSTONE_SERVICE_HOST:$KEYSTONE_AUTH_PORT/v2.0
-neutron_auth_strategy=$Q_AUTH_STRATEGY
-neutron_controller_addr=tcp:$RYU_OFP_HOST:$RYU_OFP_PORT
-"}
-    echo "${RYU_CONF_CONTENTS}" > $RYU_CONF
-}
-
-# install_ryu can be called multiple times as neutron_pluing/ryu may call
-# this function for neutron-ryu-agent
 # Make this function idempotent and avoid cloning same repo many times
 # with RECLONE=yes
 _RYU_INSTALLED=${_RYU_INSTALLED:-False}
@@ -63,17 +22,5 @@
     fi
 }
 
-function start_ryu {
-    run_process ryu "$RYU_DIR/bin/ryu-manager --config-file $RYU_CONF"
-}
-
-function stop_ryu {
-    :
-}
-
-function check_ryu {
-    :
-}
-
 # Restore xtrace
 $RYU3_XTRACE