Create /usr/zuul-env in nodepool-base

Part of our effort to migrate from puppet to dib elements.

Change-Id: Ie1b4a29a7496c862c14417344b8d51aef779e104
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

nodepool/elements/nodepool-base/install.d/89-install-zuul

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Copyright (C) 2015 OpenStack Foundation
+# Copyright 2017 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+#
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+virtualenv /usr/zuul-env
+/usr/zuul-env/bin/pip install /opt/git/openstack-infra/zuul