fixes #18476 - users have ssh keys

Fixes #18760 - Allow export to CSV

This introduces a way of exporting tables from the UI to CSV.
There are 3 steps to adding a CSV export to a table:

1. Add the CsvResponder concern to the relevant controller.
2. Add a `format.csv` block to the index controller action. This block...

fixes #18665 - call #to_h before comparing AC::Parameters to hash

Allows comparisons when ActionController::Parameters is separated from
Hash in Rails 5.0. #permit! is now called on inner hashes sent through
KeepParam (similar to rails/rails@e86524c in 5.1) so they are included...

fixes #18664 - ignore missing callbacks in SmartProxyAuth concern

Filters that are only registered on the UI controllers cause errors
when using SmartProxyAuth on an API controller under Rails 5.0.

Fixes #18582 - add missing id params to taxonomy apidoc

Fixes #16982 - Scope properly when no taxonomies are set

The default scope for hosts and other objects did not restrict
properly by taxonomies. An user without organizations or
locations, could do anything it's permissions allow to.
The list of hosts was unrestricted and showed hosts in...

Fixes #12294 - Update existing params using API

fixes #18568 - replace deprecated AC::Parameters#update

The #update method in Rails 5 is returning a HWIA rather than the
ActionController::Parameters instance, causing keep_param to return the
wrong object type. It is also deprecated in 5.0, so replace it with a...

fixes #13618 - cache expensive vmware api calls

Refs #15779 - make background processing unavailable for now (#4217)

The original PR got vetted in the packaging phase and including
foreman-task as dependency of Foreman was refused. We need to rethink
our approach for getting the foreman-tasks functionality available...