Fixes #20952 - Replace AC::Parameters Hash methods

Replaces any methods that used to be from Hash with the more limited
ActionController::Parameters API.

Fixes #20201 - Global HTTP proxy for outgoing requests

This introduce two new settings to proxy outgoing HTTP
requests and one to except certain hosts from it.

The extensions for Excon::Connection and Net::HTTP
allow setting a proxy on their requests.

Fixes #20949 - Replace deprecated AM::Errors usage

Fixes #20950 - Use 'distinct' in AR finders

Fixes #20708 - fix templates auditing

Templates were audited under parent class. This keeps separate audits
per template type and allows searching by provisioning_template and
partition_table names. It also fixes broken associations in
taxable_taxonomies table.

Fixes #19113 - use fog-ovirt method for rebooting

While fixing the waiting for stopped vm in reboot there.

Fixes #20248, #20327 - Respect context in CSV export

Since CSV export is done using an enumerator which is executed by a
different thread to the one that creates it, we need to manually pass in
the context (user, location, organization) to the enumerator.

Fixes #20384 - seed resources before admin exists

For seed scripts that executes before internal admin exist we need to
ignore creation permission check on resources that includes Authorizable
concern.

refs #19623 - fix if key method is not present for network

credit to jsherrill for the one line solution :)

Fixes #16884 - enforce granular filters even during save