Fixes #5729 - content-host lookup by uuid

Commands info, create, delete commands expect a uuid as the id.
Currently searchables for systems are resolving the db id, so
the commands can not find the system by db id. This fix allows
all systems searchables to obtain the uuid as the
id.
Merge pull request #168 from dustint-rh/985393_searchables_resolve_by_uuid_only_uuid

Fixes #5729 - content-host lookup by uuid