Monitor's _internal cq measurement is calculated incorrectly

[rossmcdonald]

Bug report

Steps to reproduce:

The call here:

if err := s.ExecuteContinuousQuery(&db, &cq, req.Now); err != nil {
	s.Logger.Info(fmt.Sprintf("error executing query: %s: err = %s", cq.Query, err))
	atomic.AddInt64(&s.stats.QueryFail, 1)
} else {
	atomic.AddInt64(&s.stats.QueryOK, 1)
}

Doesn't collect metrics accurately, since ExecuteContinousQuery doesn't always run the query if it doesn't need to be run. The call here will return nil if the query doesn't need to be run, but the s.stats.QueryOK metric is always incremented regardless. So what _internal."monitor".cq.queryOK really measures is how many CQ's are existing, which isn't useful or accurate.