Provide a tool to generate a VNFC image

Change-Id: I8a35db57b536c75860355840537afeb20d088ec6
Partial-Bug: 1673012

doc/source/devref/vnf_component_usage_guide.rst

@@ -40,7 +40,8 @@ How to setup environment
 To make use of VNFC in Tacker, we have to upload the image to the glance in
 which heat-config and heat-config agents are installed. The installation steps
 can be referred `here <https://github.com/openstack/heat-templates/blob/master/
-hot/software-config/elements/README.rst>`_.
+hot/software-config/elements/README.rst>`_. The tool
+'tools/vnfc/build_image.sh' can be used to generate such a kind of image.
 
 Currently VNFC feature works by using `heat software config <http://docs.openstack.org/
 developer/heat/template_guide/openstack.html#OS::Heat::SoftwareConfig>`_  which

tools/vnfc/build_image.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+VNFC_IMAGE=/tmp/tacker_vnfc_images
+rm -rf $VNFC_IMAGE
+mkdir $VNFC_IMAGE
+
+pip install diskimage-builder
+pip install dib-utils
+CURRENT_DIR=`pwd`
+cd $VNFC_IMAGE
+git clone https://git.openstack.org/openstack/tripleo-image-elements.git
+git clone https://git.openstack.org/openstack/heat-templates.git
+
+export ELEMENTS_PATH=tripleo-image-elements/elements:heat-templates/hot/software-config/elements
+disk-image-create vm \
+  fedora selinux-permissive \
+  os-collect-config \
+  os-refresh-config \
+  os-apply-config \
+  heat-config \
+  heat-config-ansible \
+  heat-config-cfn-init \
+  heat-config-puppet \
+  heat-config-salt \
+  heat-config-script \
+  -o fedora-software-config.qcow2