setting the events BurstSize/QPS to proper values

[weekface]

Feature Request

Is your feature request related to a problem? Please describe:

#1466 (comment)

The default is a little small, we should set them to a proper values.

	// by default, allow a source to send 25 events about an object
	// but control the refill rate to 1 new event every 5 minutes
	// this helps control the long-tail of events for things that are always
	// unhealthy
	defaultSpamBurst = 25
	defaultSpamQPS   = 1. / 300.

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