Engine: Fixes #3480: Correction to path for dashboard redirect.
Engine: Fixes #3326, 3327: Changesets & Changeset History initial conversion

Modifications to UI for Changesets and Changeset History to function
within an engine.
Engine: Dashboard: few fixes for syncs, content views and promotions
Merge pull request #3256 from ehelms/engine-fix-3480

Engine: Fixes #3480: Correction to path for dashboard redirect.
Engine: engine-users - fixes #3331
Merge pull request #3254 from thomasmckay/engine-users

Engine: engine-users - refers #3331
Merge pull request #3247 from bbuckingham/engine-changesets

Engine: Fixes #3326, 3327: Changesets & Changeset History initial conversion
Merge pull request #3260 from bbuckingham/engine-dashboard

Engine: Dashboard: few fixes for syncs, content views and promotions
Engine: Authorization: use ::User vs User

Updating references to User to explicitly point to the core
user (::User)
Engine: fixes #3332: Roles initial conversion

This is the initial conversion of the katello roles ui to work
within the engine.  This includes CRUD actions for roles
and permissions.