Add devstack plugin

Add devstack plugin which enables MKS consoles in Nova and starts the
mksproxy.

Change-Id: Ia0daaaeeb45b19d6d9edc75f1885c683e4bdf251

devstack/plugin.sh

@@ -0,0 +1,62 @@
+# Save trace setting
+XTRACE=$(set +o | grep xtrace)
+set -o xtrace
+
+# Nova virtual environment
+if [[ ${USE_VENV} = True ]]; then
+    PROJECT_VENV["nova"]=${NOVA_DIR}.venv
+    NOVA_BIN_DIR=${PROJECT_VENV["nova"]}/bin
+else
+    NOVA_BIN_DIR=$(get_python_exec_prefix)
+fi
+
+NOVA_CONF=/etc/nova/nova.conf
+
+NOVNC_MKS_DIR=$DEST/noVNC-mks
+NOVNC_MKS_REPO=${NOVNC_MKS_REPO:-https://github.com/rgerganov/noVNC.git}
+NOVNC_MKS_BRANCH=${NOVNC_MKS_BRANCH:-master}
+
+function install_mksproxy {
+    echo_summary "Installing nova-mksproxy"
+    setup_develop $DEST/nova-mksproxy
+    echo_summary "Installing noVNC (patched for MKS)"
+    git_clone $NOVNC_MKS_REPO $NOVNC_MKS_DIR $NOVNC_MKS_BRANCH
+}
+
+function configure_mksproxy {
+    echo_summary "Configuring MKS settings in nova.conf"
+    MKSPROXY_URL=${MKSPROXY_URL:-"http://$SERVICE_HOST:6090/vnc_auto.html"}
+    iniset $NOVA_CONF mks enabled "True"
+    iniset $NOVA_CONF mks mksproxy_base_url "$MKSPROXY_URL"
+}
+
+function start_mksproxy {
+    echo_summary "Starting nova-mksproxy ..."
+    source $TOP_DIR/openrc
+    run_process nova-mksproxy "$NOVA_BIN_DIR/nova-mksproxy --username admin --password $OS_PASSWORD --project admin --auth-url $OS_AUTH_URL --web $NOVNC_MKS_DIR"
+}
+
+# check for service enabled
+if is_service_enabled nova-mksproxy; then
+
+    if [[ "$1" == "stack" && "$2" == "install" ]]; then
+        # Perform installation of service source
+        install_mksproxy
+
+    elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+        # Configure after the other layer 1 and 2 services have been configured
+        configure_mksproxy
+
+    elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
+        # Initialize and start nova-mksproxy
+        start_mksproxy
+    fi
+
+    if [[ "$1" == "unstack" ]]; then
+        stop_process n-mksproxy
+    fi
+fi
+
+# Restore xtrace
+$XTRACE
+

devstack/settings

@@ -0,0 +1,2 @@
+enable_service nova-mksproxy
+