✨ Rev dependencies to k8s 1.13

[detiber]

Updates Kubernetes dependencies to v1.13, required for #275

[detiber]

@vincepri heads up

[detiber]

/assign @DirectXMan12

[DirectXMan12]

To check that this doesn't change the signature of our public interface,use #229. I need to fix it up to get it mergable, but you can run it using the code in the PR in the mean time. Just generate "before" and "after" outputs, and diff them to make sure things haven't changed.

[detiber]

@DirectXMan12 running the external objects tooling returns the following diff:

diff ~/tmp/cr-external-objects.before ~/tmp/cr-external-objects.after
< "k8s.io/client-go/rest".Config -- struct{Host string; APIPath string; k8s.io/client-go/rest.ContentConfig; Username string; Password string; BearerToken string; Impersonate k8s.io/client-go/rest.ImpersonationConfig; AuthProvider *k8s.io/client-go/tools/clientcmd/api.AuthProviderConfig; AuthConfigPersister k8s.io/client-go/rest.AuthProviderConfigPersister; ExecProvider *k8s.io/client-go/tools/clientcmd/api.ExecConfig; k8s.io/client-go/rest.TLSClientConfig; UserAgent string; Transport net/http.RoundTripper; WrapTransport func(rt net/http.RoundTripper) net/http.RoundTripper; QPS float32; Burst int; RateLimiter k8s.io/client-go/util/flowcontrol.RateLimiter; Timeout time.Duration; Dial func(ctx context.Context, network string, address string) (net.Conn, error)}
---
> "k8s.io/client-go/rest".Config -- struct{Host string; APIPath string; k8s.io/client-go/rest.ContentConfig; Username string; Password string; BearerToken string; BearerTokenFile string; Impersonate k8s.io/client-go/rest.ImpersonationConfig; AuthProvider *k8s.io/client-go/tools/clientcmd/api.AuthProviderConfig; AuthConfigPersister k8s.io/client-go/rest.AuthProviderConfigPersister; ExecProvider *k8s.io/client-go/tools/clientcmd/api.ExecConfig; k8s.io/client-go/rest.TLSClientConfig; UserAgent string; Transport net/http.RoundTripper; WrapTransport func(rt net/http.RoundTripper) net/http.RoundTripper; QPS float32; Burst int; RateLimiter k8s.io/client-go/util/flowcontrol.RateLimiter; Timeout time.Duration; Dial func(ctxcontext.Context, network string, address string) (net.Conn, error)}

There is a single (additive) change to the client-go/rest.Config object that adds BearerTokenFile string to the object.

[mengqiy]

The diff above seems to be fine.

[DirectXMan12]

/lgtm
/approve

Thanks for your work!

[k8s-ci-robot]

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