Revert "WIP - Remove lbaas from devstack proper"

The WIP prefix and the statement

"This can't merge until p-c no longer references lbaas jobs."

Should have been an indication that this patch is not quite ready to
go in as is.

This reverts commit 130c3adb0e88044c9cf3789e79f6e669fa30d7d2.

Change-Id: I57d5f9f2e66b1bdf6fca70074bc1d5678de65f38
diff --git a/lib/neutron_plugins/services/loadbalancer b/lib/neutron_plugins/services/loadbalancer
new file mode 100644
index 0000000..30e9480
--- /dev/null
+++ b/lib/neutron_plugins/services/loadbalancer
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+# Neutron loadbalancer plugin
+# ---------------------------
+
+# Save trace setting
+_XTRACE_NEUTRON_LB=$(set +o | grep xtrace)
+set +o xtrace
+
+
+AGENT_LBAAS_BINARY="$NEUTRON_BIN_DIR/neutron-lbaas-agent"
+LBAAS_PLUGIN=neutron_lbaas.services.loadbalancer.plugin.LoadBalancerPlugin
+
+function neutron_agent_lbaas_install_agent_packages {
+    if is_ubuntu || is_fedora || is_suse; then
+        install_package haproxy
+    fi
+}
+
+function neutron_agent_lbaas_configure_common {
+    _neutron_service_plugin_class_add $LBAAS_PLUGIN
+    _neutron_deploy_rootwrap_filters $NEUTRON_LBAAS_DIR
+}
+
+function neutron_agent_lbaas_configure_agent {
+    LBAAS_AGENT_CONF_PATH=/etc/neutron/services/loadbalancer/haproxy
+    mkdir -p $LBAAS_AGENT_CONF_PATH
+
+    LBAAS_AGENT_CONF_FILENAME="$LBAAS_AGENT_CONF_PATH/lbaas_agent.ini"
+
+    cp $NEUTRON_LBAAS_DIR/etc/lbaas_agent.ini.sample $LBAAS_AGENT_CONF_FILENAME
+
+    # ovs_use_veth needs to be set before the plugin configuration
+    # occurs to allow plugins to override the setting.
+    iniset $LBAAS_AGENT_CONF_FILENAME DEFAULT ovs_use_veth $Q_OVS_USE_VETH
+
+    neutron_plugin_setup_interface_driver $LBAAS_AGENT_CONF_FILENAME
+
+    if is_fedora; then
+        iniset $LBAAS_AGENT_CONF_FILENAME DEFAULT user_group "nobody"
+        iniset $LBAAS_AGENT_CONF_FILENAME haproxy user_group "nobody"
+    fi
+}
+
+function neutron_lbaas_stop {
+    pids=$(ps aux | awk '/haproxy/ { print $2 }')
+    [ ! -z "$pids" ] && sudo kill $pids || true
+}
+
+# Restore xtrace
+$_XTRACE_NEUTRON_LB