DIB element to support cinder local attach/detach functionality

This element adds python-brick-cinderclient-ext to the make customized image
to support cinder local attach/detach functionality. Currently it has the
dependency on known bug<https://launchpad.net/bugs/1623549>, which would be
resolved with next release of python-brick-cinderclient-ext.

Change-Id: Idfe83bafa2843c781c18b83f1a3aece3ae852f78

elements/python-brickclient/README.rst

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+python-brickclient
+==================
+
+* This element is aimed for providing cinder local attach/detach functionality.
+* Currently the feature has a dependency on a known bug
+  "https://launchpad.net/bugs/1623549", which has been resolved and will be part
+  of the upstream with the next release of python-brick-cinderclient-ext.
+  Note: Current version of python-brick-cinderclient-ext i.e. 0.2.0 requires and update
+  to be made in Line32 fo below script.
+  /usr/share/python-brickclient/venv/lib/python2.7/site-packages/brick_cinderclient_ext/__init__.py
+  update "brick-python-cinderclient-ext" to "python-brick-cinderclient-ext".
+
+* Usage:
+  Pass the below shell script to parameter 'user-data' and set 'config-drive=true'
+  at the time of provisioning the node via nova-boot to make cinder local
+  attach/detach commands talk to your cloud controller.
+  [Example of Config Drive Script]
+    #!/bin/bash
+    FILE="/etc/bash.bashrc"
+    [ ! -f "$FILE" ] && touch "$FILE"
+    echo 'export OS_AUTH_URL="http://<controller_ip>:5000/v2.0"' >> "$FILE"
+    echo 'export OS_PASSWORD="password"'  >> "$FILE"
+    echo 'export OS_USERNAME="demo"' >> "$FILE"
+    echo 'export OS_TENANT_NAME="demo"'  >> "$FILE"
+    echo 'export OS_PROJECT_NAME="demo"' >> "$FILE"
+    exec bash
+  To attach: /usr/share/python-brickclient/venv/bin/cinder local-attach <volume_id>
+  To detach: /usr/share/python-brickclient/venv/bin/cinder local-detach <volume_id>
+
+* Alternatively, the same action can be completed manually at the node which does
+  not require setting up of config drive such as:
+  /usr/share/python-brickclient/venv/bin/cinder --os-username demo --os-password \
+  password  --os-tenant-name demo --os-project-name demo \
+  --os-auth-url=http://<controller_ip>:5000/v2.0 local-attach <volume_id>

elements/python-brickclient/element-deps

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+package-installs
+pip-and-virtualenv

elements/python-brickclient/package-installs.yaml

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+libssl-dev:
+libffi-dev:
+python-dev:

elements/python-brickclient/pkg-map

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+{
+  "family": {
+    "redhat": {
+      "python-dev": "python2-devel",
+      "libssl-dev": "openssl-devel",
+      "libffi-dev": "libffi-devel"
+    }
+  },
+  "default": {
+    "python-dev": "python-dev",
+    "libssl-dev": "libssl-dev",
+    "libffi-dev": "libffi-dev"
+  }
+}

elements/python-brickclient/post-install.d/55-brick-client-install

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+#!/bin/bash
+#
+# Copyright 2016 Hewlett Packard Enterprise Company, L.P.
+#
+# 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.
+
+if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
+    set -x
+fi
+
+set -eu
+set -o pipefail
+
+PBCDIR=/usr/share/python-brickclient
+mkdir $PBCDIR
+
+# create the virtual environment
+virtualenv $PBCDIR/venv
+
+# Install the required packages inside virtual env
+$PBCDIR/venv/bin/pip install python-brick-cinderclient-ext
+
+ln -s $PBCDIR/venv/bin/python-brickclient /usr/local/bin/python-brickclient