Agent TLS registration does not work in disributed monitoring

[robin-checkmk]

I think the remote registration does not work in combination with checkmk_agent_add_host:true and checkmk_agent_auto_activate:true.

In this case the new hosts are created on the central site and only activated on the central site, but not on the remote site where the registration takes place. This leads to an error in checkmk.general.agent : Linux: Register Agent for TLS.

A fix would be to introduce a second handler wich only runs when checkmk_agent_site != checkmk_agent_registration_site

Originally posted by @DominikBauer1 in #219 (comment)