Validate grafyaml based on master

Rather than installing grafyaml from pypi, install it with
zuul-cloner so that it may be validated with the contents of
master (or even changes in review).  We run grafyaml continuously
deployed from source rather than installing from pypi, so this
more closely matches what we actually want to validate.

Change-Id: I26663e5c70883b910fced6c32ae364734542b5a5

test-requirements.txt

@@ -1,4 +1,3 @@
 hacking>=0.10,<0.11
 bashate>=0.2
-grafyaml
 -e git://git.openstack.org/openstack-infra/nodepool#egg=nodepool

tools/grafyaml-validate.sh

@@ -0,0 +1,49 @@
+#!/bin/bash -e
+
+# Copyright 2016 IBM Corp.
+#
+# 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. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+ROOT=`pwd`
+if [ -z $VIRTUAL_ENV ]; then
+    echo "VIRTUAL_ENV environment variable not found"
+    echo "Run this script with 'tox -e grafyaml' and with recent versions"
+    echo "of tox and virtualenv installed."
+    exit 1
+fi
+
+cd $VIRTUAL_ENV
+if [ ! -e /usr/zuul-env/bin/zuul-cloner ] &&
+    [ ! -e $VIRTUAL_ENV/bin/zuul-cloner ];
+then
+    echo "Need to install zuul-cloner"
+    git clone https://git.openstack.org/openstack-infra/zuul
+    cd zuul
+    pip install .
+    cd ..
+fi
+
+if [ -e /usr/zuul-env/bin/zuul-cloner ]; then
+    ZC=/usr/zuul-env/bin/zuul-cloner
+else
+    ZC=$VIRTUAL_ENV/bin/zuul-cloner
+fi
+echo "Zuul-cloner is $ZC"
+
+$ZC --cache-dir /opt/git https://git.openstack.org openstack-infra/grafyaml
+cd openstack-infra/grafyaml
+pip install .
+cd ../..
+
+cd $ROOT
+grafana-dashboard validate grafana

tox.ini

@@ -46,7 +46,7 @@ select = H231
 
 [testenv:grafyaml]
 basepython = python2.7
-commands = grafana-dashboard validate grafana
+commands = {toxinidir}/tools/grafyaml-validate.sh
 
 [testenv:jjb]
 basepython = python2.7