UPSTREAM: 67093: improve config file modification time

Trades runtime complexity for spacial complexity when modifying large amounts of contexts on a kubeconfig. In cases where there are few destination filenames for a given amount of contexts, but a large amount of contexts, this patch prevents reading and writing to the same file (or small number of files) over and over again needlessly.
openshift · Aug 10, 2018 · 68ec3d8 · 68ec3d8
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diff --git a/vendor/k8s.io/kubernetes/staging/src/k8s.io/client-go/tools/clientcmd/client_config_test.go b/vendor/k8s.io/kubernetes/staging/src/k8s.io/client-go/tools/clientcmd/client_config_test.go
diff --git a/vendor/k8s.io/kubernetes/staging/src/k8s.io/client-go/tools/clientcmd/config.go b/vendor/k8s.io/kubernetes/staging/src/k8s.io/client-go/tools/clientcmd/config.go