Add instack-vm element

This allows the instack vm to be built using diskimage-builder
instead of virt-builder.

elements/instack-vm/README.md

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+Build an instack vm image
+
+This element allows building an instack vm image using diskimage-builder. To build
+the image simply include this element and the appropriate distro element.
+For example:
+
+disk-image-create -a amd64 -o instack \
+    --image-size 30 \
+    fedora instack-vm

elements/instack-vm/element-deps

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+stackuser
+vm

elements/instack-vm/extra-data.d/50-add-instack-files

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+file_list="/home/stack/.ssh/id_rsa_virt_power
+/home/stack/.ssh/id_rsa_virt_power.pub
+/tmp/deploy-virt-overcloudrc
+/tmp/instack.answers"
+for f in $file_list; do
+    cp "$f" "$TMP_HOOKS_PATH"
+done

elements/instack-vm/install.d/51-instack-files

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages net-tools yum-utils git
+
+mkdir -p /home/stack/.ssh
+cp /tmp/in_target.d/id_rsa_virt_power /home/stack/.ssh/id_rsa_virt_power
+cp /tmp/in_target.d/id_rsa_virt_power.pub /home/stack/.ssh/id_rsa_virt_power.pub
+cp /tmp/in_target.d/deploy-virt-overcloudrc /home/stack/deploy-overcloudrc
+cp /tmp/in_target.d/instack.answers /home/stack/instack.answers
+
+chown -R stack:stack /home/stack

elements/instack-vm/post-install.d/90-remove-cloud-init

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+yum erase -y cloud-init