[collectd] Small notifications patch for 5.0.1

[Chris Panayis]

Hi - Please find attached a tiny patch for 5.0.1 notifications which:

1. Fixes bug with non interesting values being notified when data is 
missing.

2. Adds a new option 'SendNotify' to the network plugin to disable 
sending of notifications. Useful when you have collectd processes 
monitoring each other (or local notifications are dealt with locally and 
therefore should not be sent upstream). Usage:

<Plugin network>

   SendNotify false

<Listen ...>
     ...
</Listen>
<Server ...>
     ...
</Server>
</Plugin>


Kind regards

Chris
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