Added content-view tests related to redhat content.

Added support to handle even redhat content from manifests, to the
`setup_to_create_cv` function.

Note:- No lifecycle env creation required while publishing.

Fixes for formatting and using the proper api sync function call
Merge pull request #1556 from kbidarkar/add-cv-rh_content-tests

Added content-view tests related to redhat content.
Drop the * operator from a function call

The `*` operator is a useful tool, but it's also fairly mysterious. Use
`chain.from_iterable` instead.