1. Make kubelet default to 10ms for CPU quota if limit < 10m for

backwards compat.
2. Update documentation to reflect minimum CPU limits.

Signed-off-by: Vishnu kannan <vishnuk@google.com>

pkg/kubelet/dockertools/docker.go

@@ -50,7 +50,8 @@ const (
 	milliCPUToCPU = 1000
 
 	// 100000 is equivalent to 100ms
-	quotaPeriod = 100000
+	quotaPeriod   = 100000
+	minQuotaPerod = 1000
 )
 
 // DockerInterface is an abstract interface for testability.  It abstracts the interface of docker.Client.
@@ -317,6 +318,11 @@ func milliCPUToQuota(milliCPU int64) (quota int64, period int64) {
 	// we then convert your milliCPU to a value normalized over a period
 	quota = (milliCPU * quotaPeriod) / milliCPUToCPU
 
+	// quota needs to be a minimum of 1ms.
+	if quota < minQuotaPerod {
+		quota = minQuotaPerod
+	}
+
 	return
 }