Create os-cloud-config element

Create an element for installing os-cloud-config, in case there is
ever a time when it is intended to be run from a deployed image,
rather than on the host that is running devtest.

Change-Id: Id126495a4ead2aba00fb33619352dc2daae4acc5
Co-Authored-By: Jon-Paul Sullivan <jonpaul.sullivan@hp.com>

elements/os-cloud-config/README.md

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+Install os-cloud-config
+=======================
+
+os-cloud-config contains useful utilities such as init-keystone, register-nodes

elements/os-cloud-config/element-deps

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+pip-and-virtualenv
+pip-manifest

elements/os-cloud-config/environment.d/10-os-cloud-config-install-options.bash

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+#!/bin/bash
+
+export DIB_INSTALLTYPE_os_cloud_config="${DIB_INSTALLTYPE_os_cloud_config:-"pip"}"

elements/os-cloud-config/install.d/os-cloud-config-package-install/90-os-cloud-config

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+#!/bin/bash
+
+set -eux
+set -o pipefail
+
+install-packages os-cloud-config

elements/os-cloud-config/install.d/os-cloud-config-pip-install/90-os-cloud-config

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+#!/bin/bash
+set -eux
+set -o pipefail
+
+manifest=$(get-pip-manifest os-cloud-config)
+VENV=/opt/stack/venvs/os-cloud-config
+
+virtualenv --setuptools $VENV
+set +u
+source ${VENV}/bin/activate
+set -u
+
+if [ -n "$manifest" ]; then
+    use-pip-manifest $manifest
+else
+    # bug #1201253 : virtualenv-1.10.1 embeds setuptools-0.9.8, which
+    # doesn't manage correctly HTTPS sockets when downloading pbr from
+    # https://pypi.python.org/simple/ if using http_proxy and https_proxy
+    # envvars
+    ${VENV}/bin/pip install -U 'setuptools>=1.0'
+    # bug #1293812 : Avoid easy_install triggering on pbr.
+    ${VENV}/bin/pip install -U 'pbr>=0.6,<1.0'
+    ${VENV}/bin/pip install --install-option="--install-scripts=/usr/local/bin" -U os-cloud-config
+fi
+
+# Write the manifest of what was installed
+write-pip-manifest os-cloud-config
+
+set +u
+deactivate
+set -u