Fixes #4818 - Allow users to remove views from environments
Fixes #5102, BZ1084855, limit sync plan add list to enabled products.
Merge pull request #3955 from waldenraines/bug-5102

Fixes #5102, BZ1084855, limit sync plan add list to enabled products.
Merge pull request #3953 from daviddavis/cve-deletion

Content view environment deletion
Fixes #5103, BZ1084855: allow sync plans to be added to RH products.