Pretty print JSON sample files

Pretty print of JSON sample files for Compute API v3, database-api,
Identity APIs. Follows JSON formatting conventions.

Change-Id: If4e3a9435e99fc2a726cae412051c592c8df5ec1
Partial-Bug: #1217503
Pretty print JSON sample files

Pretty print remaining samples under api-ref/src/wadls.
Follows JSON formatting conventions.

Change-Id: Iad6209a823d35a6968a968c56e69862cd2a931c6
Partial-Bug: #1217503
Merge "Pretty print JSON sample files"