Feature global notification handler

[sni]

Add global notification handler in the same way as global event handlers. It adds 2 new global options:

• global_host_notification_handler=global-host-notify
• global_service_notification_handler=global-service-notify

which will be run each time a normal notification would be considered. It does not require contacts for hosts and services. If used it will also prevent warnings if hosts/services do not have contacts set. The global notification handlers do not have any contact macros set, because they are independent of contacts.

This PR also adds another global option:

• log_global_notifications

This option can be used to suppress a log entry each time the global notification handler is run.

Finally this PR adds a new generic external command

• LOG

It can be used to add custom log entries to the main naemon log file. For example to add the actual notified contacts to the log file.

ex.:

printf "[%lu] LOG;SERVICE NOTIFICATION: test contact;testhost;test service;CRITICAL;notify-by-email;test message\n" `date +%s` >> .../tmp/run/naemon.cmd

which would add a log entry similar to a normal notification. The actual hosts/services/contacts and commands don't have to exist.

Or other notes like ex.:

printf "[%lu] LOG;SERVICE NOTE: testhost;event handler restarted service successfully\n" `date +%s` >> .../tmp/run/naemon.cmd

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