Support for writable_files like writable_dirs

[alexgit2k]

The writable-recipie allows to set the owner/group of directories. If also owner/group of files should be set, the workaround (except run) is to use writable_recursive: true and add the parent-directory to writable_dirs. But this changes the permissions of all files and directories within the specified directories. So a new option writable_files would be handy, which sets the owner/group only for the configured files.

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[antonmedv]

I like the idea. Let's figure out on how can we refactor recipe.

[ronald2wing]

How are you dealing with writable files now?