Create a new manifest format that uses 'literal block scalar' for key/value pairs

[markpollack]

http://blogs.perl.org/users/tinita/2018/03/strings-in-yaml---to-quote-or-not-to-quote.html

This would likely reduce the complexity we have using the double-quoted scalara approach with escaping and unescaping special chars.

[sabbyanandan]

This feels too risky to do so late in the RC timeline. Besides that, it is an investigative story, which if it is required, it will impact both Skipper and SCDF.