Check_MK Werk 5472: Ensure correct quoting of values in event contexts.

ID: 5472 Title: Ensure correct quoting of values in event contexts. Component: cmc Level: 1 Class: Bug fix Version: 1.5.0i2 The values of custom host/service variables and acknowledgement comments were not correctly quoted when being passed to the alert/notification helpers. Therefore, some special characters could have been mishandled, this has been fixed.