Add documentation link for Pepa
Updated documentation in-line using rst
Fixed RST code-blocks
Added support for validation schemas, req. cerberus module
Fixed ceberus import check and removed test for os.path since its a core module
Updated documentation
Added Pepa grains/pillar def. for documentation
Fixed typo in doc
Fixed RST indentation again...
Fixed typos in RST doc
Made cerberus optional only when using validation from terminal
Code cleanup for operators
Merge pull request #15691 from mickep76/develop

Added reference to Pepa doc. and in-line rst documentation