Enable plug-ins to bring in action for multiple hosts
The /hosts page allows users to controll multiple hosts at time by button list.
I would like to allow plug-ins to modify this button list.
Review foreman_openscap use-case at: https://isimluk.fedorapeople.org/blog/pics/multiple_hosts_actions.jpg
fixes #8592 - allow plug-ins to modify multiple hosts actions
Refactoring patern: Extract method.