update vendor prometheus/common to newest release

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/silence.go

@@ -59,8 +59,8 @@ func (m *Matcher) Validate() error {
 	return nil
 }
 
-// Silence defines the representation of a silence definiton
-// in the Prometheus eco-system.
+// Silence defines the representation of a silence definition in the Prometheus
+// eco-system.
 type Silence struct {
 	ID uint64 `json:"id,omitempty"`
 

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
 }
@@ -163,9 +163,21 @@ func (t *Time) UnmarshalJSON(b []byte) error {
 // This type should not propagate beyond the scope of input/output processing.
 type Duration time.Duration
 
+// Set implements pflag/flag.Value
+func (d *Duration) Set(s string) error {
+	var err error
+	*d, err = ParseDuration(s)
+	return err
+}
+
+// Type implements pflag.Value
+func (d *Duration) Type() string {
+	return "duration"
+}
+
 var durationRE = regexp.MustCompile("^([0-9]+)(y|w|d|h|m|s|ms)$")
 
-// StringToDuration parses a string into a time.Duration, assuming that a year
+// ParseDuration parses a string into a time.Duration, assuming that a year
 // always has 365d, a week always has 7d, and a day always has 24h.
 func ParseDuration(durationStr string) (Duration, error) {
 	matches := durationRE.FindStringSubmatch(durationStr)
@@ -202,6 +214,9 @@ func (d Duration) String() string {
 		ms   = int64(time.Duration(d) / time.Millisecond)
 		unit = "ms"
 	)
+	if ms == 0 {
+		return "0s"
+	}
 	factors := map[string]int64{
 		"y":  1000 * 60 * 60 * 24 * 365,
 		"w":  1000 * 60 * 60 * 24 * 7,

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

@@ -100,7 +100,7 @@ func (s *SamplePair) UnmarshalJSON(b []byte) error {
 }
 
 // Equal returns true if this SamplePair and o have equal Values and equal
-// Timestamps. The sematics of Value equality is defined by SampleValue.Equal.
+// Timestamps. The semantics of Value equality is defined by SampleValue.Equal.
 func (s *SamplePair) Equal(o *SamplePair) bool {
 	return s == o || (s.Value.Equal(o.Value) && s.Timestamp.Equal(o.Timestamp))
 }
@@ -117,7 +117,7 @@ type Sample struct {
 }
 
 // Equal compares first the metrics, then the timestamp, then the value. The
-// sematics of value equality is defined by SampleValue.Equal.
+// semantics of value equality is defined by SampleValue.Equal.
 func (s *Sample) Equal(o *Sample) bool {
 	if s == o {
 		return true