Imports of package upgrade

PathSynopsis
bufioPackage bufio implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O.
bytesPackage bytes implements functions for the manipulation of byte slices.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/ghodss/yaml
github.com/spf13/cobraPackage cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
ioPackage io provides basic interfaces to I/O primitives.
k8s.io/apimachinery/pkg/util/setsPackage sets has generic set and specified sets.
k8s.io/client-go/discovery/fake
k8s.io/client-go/kubernetesPackage kubernetes holds packages which implement a clientset for Kubernetes APIs.
k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadmPackage kubeadm is the package that contains the libraries that drive the kubeadm binary.
k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1alpha1
k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/validation
k8s.io/kubernetes/cmd/kubeadm/app/cmd/util
k8s.io/kubernetes/cmd/kubeadm/app/constants
k8s.io/kubernetes/cmd/kubeadm/app/features
k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane
k8s.io/kubernetes/cmd/kubeadm/app/phases/upgrade
k8s.io/kubernetes/cmd/kubeadm/app/preflight
k8s.io/kubernetes/cmd/kubeadm/app/utilPackage util contains kubeadm utilities.
k8s.io/kubernetes/cmd/kubeadm/app/util/apiclientPackage apiclient contains wrapping logic for Kubernetes API clients.
k8s.io/kubernetes/cmd/kubeadm/app/util/configPackage config contains utilities for managing the kubeadm configuration API.
k8s.io/kubernetes/cmd/kubeadm/app/util/dryrun
k8s.io/kubernetes/cmd/kubeadm/app/util/etcd
k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig
k8s.io/kubernetes/pkg/api/legacyscheme
k8s.io/kubernetes/pkg/util/version
osPackage os provides a platform-independent interface to operating system functionality.
sortPackage sort provides primitives for sorting slices and user-defined collections.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
text/tabwriterPackage tabwriter implements a write filter (tabwriter.Writer) that translates tabbed columns in input into properly aligned text.
timePackage time provides functionality for measuring and displaying time.