Pretty print JSON sample files and remove unused files

Pretty print JSON samples to follow JSON formatting conventions.

Replace JSON and XML files with reference to api-site, so that we only
have one place with these files.

Remove unused JSON and XML sample files.

Co-Autored-By: Diane Fleming <diane.fleming@rackspace.com>

Partial-Bug: #1217503

Change-Id: If7b98a321b373d183859ba1ebce5cdd131b43161
Merge "Pretty print JSON sample files and remove unused files"