callouts: add script to generate callout mappings

Add a script that can generate callout mappings. The script needs an
input YAML to denote callout mappings. Add an example YAML.

Change-Id: I7b49fe4c586bf7abfed2865cfd776de4d5745ef5
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
2 files changed