Fixes #7394: Stop blocking plugin routes from being loaded properly.

Prior to tis change, if a Foreman plugin was declared via bundler
after Katello in load order, the routes would not get properly loaded
within the application. This meant that these routes were in-accessible,
and could lead to intermittent and un-expected behaviors.
fixes #7404 - add salt support to katello templates
fixes #7410 - replaced query_params with params
Merge pull request #4650 from stbenjam/7404

fixes #7404 - add salt support to katello templates
Merge pull request #4652 from thomasmckay/7410-sub-mgr

fixes #7410 - replaced query_params with params
Merge pull request #4648 from ehelms/fixes-7394

Fixes #7394: Stop blocking plugin routes from being loaded properly.