Add a directory for overcloud heat environments

This patch adds a new directory called environments which contains
custom Heat environment files that can be used to enable custom
overcloud features. As an initial example a puppet-ceph-devel.yaml
environment has been added which can be used to spin up a small Ceph
cluster for dev/testing.

This directory may be useful for collecting other
feature related Heat environment settings in the future as well.
Things like isolated network settings, etc.

Change-Id: Ia6998ae05d2363384d2a616a31d5795c8b2d85d5

environments/README.md

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+This directory contains Heat environment file snippets which can
+be used to enable features in the Overcloud.
+
+Configuration
+-------------
+
+These can be enabled using the -e [path to environment yaml] option with
+heatclient.
+
+Below is an example of how to enable the Ceph template using
+devtest\_overcloud.sh:
+
+    export OVERCLOUD\_CUSTOM\_HEAT\_ENV=$TRIPLEO\_ROOT/tripleo-heat-templates/environments/ceph_devel.yaml

environments/puppet-ceph-devel.yaml

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+# A Heat environment file which can be used to enable a Ceph
+# storage cluster using the controller and 2 ceph nodes.
+# Rbd backends are enabled for Cinder, Glance, and Nova.
+parameters:
+  CephStorageCount: 2
+  #NOTE: These ID's and keys should be regenerated for
+  # a production deployment. What is here is suitable for
+  # developer and CI testing only.
+  CephClusterFSID: '4b5c8c0a-ff60-454b-a1b4-9747aa737d19'
+  CephMonKey: 'AQC+Ox1VmEr3BxAALZejqeHj50Nj6wJDvs96OQ=='
+  CephAdminKey: 'AQDLOh1VgEp6FRAAFzT7Zw+Y9V6JJExQAsRnRQ=='
+  NovaEnableRbdBackend: true
+  CinderEnableRbdBackend: true
+  GlanceBackend: rbd
+  CinderEnableIscsiBackend: false
+  ControllerEnableCephStorage: true