Werk #1570: Fix notification of check_http active checks with Nagios core

When using Nagios as the core and a check command that contains single quotes then the notification would not work. This is because the variables are enclosed in single quotes in check_mk_templates.cfg. That file has been changed so that for the check command macros double quotes are being used. Check_MK itself does never use double quotes in its strings so this is less likely to cause problems.

The Check_MK Micro Core does not have this problem. Everything works fine here.

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