Fixes #5711 - Doc id in ContentHosts update

Hammer-cli-katello is unable to recognize --id param for in the
subcommand content-host update. Apipie param 'id' is missing for
the update in systems controller.
Merge pull request #4084 from dustint-rh/add_apipie_id_param_to_content_host_update

Fixes #5711 - Doc id in ContentHosts update
merging for @dustint-rh thanks!