Prevent 3rd parties to access centralized application logs

[Lourenço P. Soares]

Why

Dispatcher logs are currently written to temp, which means that any 3rd party with access to the Dispatcher Manager machine can see logs entries for all dispatchers

Definition of done

Logs are written to /var/log or using syslog service

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Notes

@fbernitt had an idea on how to do this.

[Jefferson Stachelski]

Removed the logging to "/tmp/pixelated.log" file from Pixelated-user-agent