Pull up encrypted data bag secret management into the base classes, thus
also unifying the functionality.
Especially this complements the issues:
* Upload the secret to provisioning path also with chef-solo [GH-1246]
* Delete the secret also with chef-client [GH-2712]
* Remove the secret before uploading also with chef-client [GH-1111]
of `args` itself and as an element inside of an `args` array. Added validation
around passing in arrays for arguments. Just knowing that it is an array is not
enough, because arrays can contain any other type.
The logic change in 57d4775140 introduced
a bug where neither strings nor arrays provided as `args` for shell
provisioners would pass validation.
This fixes that problem along with a few extras:
- split out arg validation into a private method
- update comment describing valid args
- add a few unit tests around config validation
Teemu Matilainen
Ryan Uber
Mitchell Hashimoto
Paul Hinze