updating github.com/jonboulle/clockwork to v0.1.0

vendor/github.com/jonboulle/clockwork/clockwork.go

@@ -32,10 +32,17 @@ func NewRealClock() Clock {
 }
 
 // NewFakeClock returns a FakeClock implementation which can be
-// manually advanced through time for testing.
+// manually advanced through time for testing. The initial time of the
+// FakeClock will be an arbitrary non-zero time.
 func NewFakeClock() FakeClock {
+	// use a fixture that does not fulfill Time.IsZero()
+	return NewFakeClockAt(time.Date(1984, time.April, 4, 0, 0, 0, 0, time.UTC))
+}
+
+// NewFakeClockAt returns a FakeClock initialised at the given time.Time.
+func NewFakeClockAt(t time.Time) FakeClock {
 	return &fakeClock{
-		l: sync.RWMutex{},
+		time: t,
 	}
 }
 
@@ -117,9 +124,10 @@ func (fc *fakeClock) Sleep(d time.Duration) {
 
 // Time returns the current time of the fakeClock
 func (fc *fakeClock) Now() time.Time {
-	fc.l.Lock()
-	defer fc.l.Unlock()
-	return fc.time
+	fc.l.RLock()
+	t := fc.time
+	fc.l.RUnlock()
+	return t
 }
 
 // Advance advances fakeClock to a new point in time, ensuring channels from any