fixes #5796 - adding some comps entries for f19
Fixes #5654 - Permissions for env promotion/remove

This commit contains code to handle environment promotion and deletion.
Basic Rules
To Promote/Remove you need
1) promote_or_remove_content_views from content views
2) promote_or_remove_content_views_to_environment from lifecycle environments.

Note: Remove of a content view is slightly different from "destroy".
Remove implies removal of content view versions which could entail
removal from environments.
Merge pull request #4114 from jlsherrill/comps

fixes #5796 - adding some comps entries for f19
Merge pull request #4103 from parthaa/env-promo

Fixes #5654 - Permissions for env promotion/remove
Fixes #5821 - Capsule Content API/Backend
Fixes #5821 - Remove the fort engine

The code now uses mainly the Foreman's proxy logic + additional
support in Katello itself: not need to maintain separate engine just
for the node syncing