Support extended pod logging options

Increase the supported controls on pod logging. Add validaiton to pod
log options. Ensure the Kubelet is using a consistent, structured way to
process pod log arguments.

Add ?sinceSeconds=<durationInSeconds>, &sinceTime=<RFC3339>, ?timestamps=<bool>,
?tailLines=<number>, and ?limitBytes=<number>

pkg/api/helpers.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"reflect"
 	"strings"
+	"time"
 
 	"k8s.io/kubernetes/pkg/api/resource"
 	"k8s.io/kubernetes/pkg/api/unversioned"
@@ -235,3 +236,15 @@ func containsAccessMode(modes []PersistentVolumeAccessMode, mode PersistentVolum
 	}
 	return false
 }
+
+// ParseRFC3339 parses an RFC3339 date in either RFC3339Nano or RFC3339 format.
+func ParseRFC3339(s string, nowFn func() unversioned.Time) (unversioned.Time, error) {
+	if t, timeErr := time.Parse(time.RFC3339Nano, s); timeErr == nil {
+		return unversioned.Time{t}, nil
+	}
+	t, err := time.Parse(time.RFC3339, s)
+	if err != nil {
+		return unversioned.Time{}, err
+	}
+	return unversioned.Time{t}, nil
+}