Add Sails Express.js hardcoded secrets

[cosad3s]

See:

• https://github.com/balderdashy/sails/blob/master/lib/hooks/session/index.js
• https://github.com/balderdashy/sails/blob/master/test/unit/req.session.test.js
• https://github.com/balderdashy/sails/blob/master/docs/concepts/Sessions/sessions.md

For production, default secret should be a MD5 generated string from Date, random 64-byte and Node.js version (https://github.com/balderdashy/sails-generate), if not changed by the maintainer.

[liquidsec]

Nice Find, Thanks for the PR!