add cmd option "only_on" allowing to limit on what host #88
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This adds a new option to the command allowing limit a particular command to run on a particular host(s). This is somewhat similar to #85 but works on the command level, and limits can be hostname or address. It also allows reverse the condition with
!prefix, meaning "only on other hosts".Not something I would often use, as I'd rather make a separate task for such commands, but in some cases can be handy. For example, running a simplified playbook and wanting some command to initialize only one of the destination hosts in a special way