Remove knative pkg

CORS and RetryOn are missing from the knative pkg.
Until Istio has an official k8s client, we'll maintain our own.

vendor/github.com/prometheus/common/model/metric.go

@@ -21,7 +21,6 @@ import (
 )
 
 var (
-	separator = []byte{0}
 	// MetricNameRE is a regular expression matching valid metric
 	// names. Note that the IsValidMetricName function performs the same
 	// check but faster than a match with this regular expression.

vendor/github.com/prometheus/common/model/time.go

@@ -43,7 +43,7 @@ const (
 // (1970-01-01 00:00 UTC) excluding leap seconds.
 type Time int64
 
-// Interval describes and interval between two timestamps.
+// Interval describes an interval between two timestamps.
 type Interval struct {
 	Start, End Time
 }