Remote Execution (REX) is a crucial plugin for many users. When reading the Managing Hosts (6.18) guide it is used all over the place. In particular, https://docs.redhat.com/en/documentation/red_hat_satellite/6.18/html/managing_hosts/configuring-and-setting-up-remote-jobs describes the different modes how it can be set up.

Acceptance criteria:

• Remote Execution via SSH works with Password and Public Key
• All documented workflows (like changing the remote working directory, distributing ssh keys, etc) are still working or have been updated.
• Rewritten code is tested and verified.
• The documentation is updated
• The foreman-proxy container image is updated to include the REX SSH plugin, which is disabled by default