Update dependenciess

Exclude minio-go for now (pin to 3.x.y).

vendor/cloud.google.com/go/internal/testutil/unique.go

@@ -31,17 +31,24 @@ var startTime = time.Now().UTC()
 // A UIDSpace manages a set of unique IDs distinguished by a prefix.
 type UIDSpace struct {
 	Prefix string
+	Sep    rune
 	re     *regexp.Regexp
 	mu     sync.Mutex
 	count  int
 }
 
 func NewUIDSpace(prefix string) *UIDSpace {
+	return NewUIDSpaceSep(prefix, '-')
+}
+
+func NewUIDSpaceSep(prefix string, sep rune) *UIDSpace {
+	re := fmt.Sprintf(`^%s%[2]c(\d{4})(\d{2})(\d{2})%[2]c(\d+)%[2]c\d+$`,
+		regexp.QuoteMeta(prefix), sep)
 	return &UIDSpace{
 		Prefix: prefix,
-		re:     regexp.MustCompile("^" + regexp.QuoteMeta(prefix) + `-(\d{4})(\d{2})(\d{2})-(\d+)-\d+$`),
+		Sep:    sep,
+		re:     regexp.MustCompile(re),
 	}
-
 }
 
 // New generates a new unique ID . The ID consists of the UIDSpace's prefix, a
@@ -49,7 +56,7 @@ func NewUIDSpace(prefix string) *UIDSpace {
 // execution will have the same timestamp.
 //
 // Aside from the characters in the prefix, IDs contain only letters, numbers
-// and hyphens.
+// and sep.
 func (s *UIDSpace) New() string { return s.newID(startTime) }
 
 func (s *UIDSpace) newID(t time.Time) string {
@@ -62,7 +69,8 @@ func (s *UIDSpace) newID(t time.Time) string {
 	y, m, d := t.Date()
 	ns := t.Sub(time.Date(y, m, d, 0, 0, 0, 0, time.UTC))
 	// Zero-pad the counter for lexical sort order for IDs with the same timestamp.
-	return fmt.Sprintf("%s-%04d%02d%02d-%d-%04d", s.Prefix, y, m, d, ns, c)
+	return fmt.Sprintf("%s%c%04d%02d%02d%c%d%c%04d",
+		s.Prefix, s.Sep, y, m, d, s.Sep, ns, s.Sep, c)
 }
 
 // Timestamp extracts the timestamp of uid, which must have been generated by

vendor/cloud.google.com/go/internal/testutil/unique_test.go

@@ -27,6 +27,13 @@ func TestNew(t *testing.T) {
 	if got != want {
 		t.Errorf("got %q, want %q", got, want)
 	}
+
+	s2 := NewUIDSpaceSep("prefix2", '_')
+	got = s2.newID(tm)
+	want = "prefix2_20170106_21_0000"
+	if got != want {
+		t.Errorf("got %q, want %q", got, want)
+	}
 }
 
 func TestTimestamp(t *testing.T) {