icinga: move ssl_settings to role class

follow-up to I31e1232a043e3fc42
put the ssl_settings into the role class
if they are here they are not found and the template
can't be parsed

Change-Id: I5d147d5ad0a15d9abac8ba73a4b0b6d0a855a4c7
Merge "icinga: move ssl_settings to role class" into production