Add structure for Devstack plugin

This review creates the structure for the Devstack plugin and
prints to the console to ensure its execution in the gate.

Follow-up reviews will do more useful stuff like setting up
the environment for our functional testing (ldap, federation).

Change-Id: I820ae355ae8f3183fee2b8207e3c17e8bd10dc17

devstack/plugin.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# Copyright 2016 Massachusetts Open Cloud
+#
+# 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.
+
+# For more information on Devstack plugins, including a more detailed
+# explanation on when the different steps are executed please see:
+# http://docs.openstack.org/developer/devstack/plugins.html
+
+if [[ "$1" == "stack" && "$2" == "install" ]]; then
+    # This phase is executed after the projects have been installed
+    echo "Keystone plugin - Install phase"
+
+elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+    # This phase is executed after the projects have been configured and
+    # before they are started
+    echo "Keystone plugin - Post-config phase"
+
+elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
+    # This phase is executed after the projects have been started
+    echo "Keystone plugin - Extra phase"
+fi
+
+if [[ "$1" == "unstack" ]]; then
+    # Called by unstack.sh and clean.sh
+    # Undo what was performed during the "post-config" and "extra" phases
+    :
+fi
+
+if [[ "$1" == "clean" ]]; then
+    # Called by clean.sh after the "unstack" phase
+    # Undo what was performed during the "install" phase
+    :
+fi

tox.ini

@@ -32,7 +32,7 @@ commands =
   flake8
   # Run bash8 during pep8 runs to ensure violations are caught by
   # the check and gate queues
-  bashate examples/pki/gen_pki.sh
+  bashate examples/pki/gen_pki.sh devstack/plugin.sh
   # Run security linter
   bandit -r keystone -x tests