Update godeps for etcd 3.0.4

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

@@ -15,15 +15,11 @@ package model
 
 import (
 	"fmt"
-	"regexp"
 	"sort"
 	"strings"
 )
 
-var (
-	separator    = []byte{0}
-	MetricNameRE = regexp.MustCompile(`^[a-zA-Z_][a-zA-Z0-9_:]*$`)
-)
+var separator = []byte{0}
 
 // A Metric is similar to a LabelSet, but the key difference is that a Metric is
 // a singleton and refers to one and only one stream of samples.
@@ -83,16 +79,3 @@ func (m Metric) Fingerprint() Fingerprint {
 func (m Metric) FastFingerprint() Fingerprint {
 	return LabelSet(m).FastFingerprint()
 }
-
-// IsValidMetricName returns true iff name matches the pattern of MetricNameRE.
-func IsValidMetricName(n LabelValue) bool {
-	if len(n) == 0 {
-		return false
-	}
-	for i, b := range n {
-		if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || b == ':' || (b >= '0' && b <= '9' && i > 0)) {
-			return false
-		}
-	}
-	return true
-}