Add a --raw flag to kubectl config view

Defaults to false, unless --flatten is specified. Default behavior
(--raw=false) is that byte data (Client{Certificate,Key}data,
CertificateAuthorityData) is redacted for a more human-readable view.
Useful for manually inspecting files that have embeded data.

contrib/completions/bash/kubectl

@@ -646,6 +646,7 @@ _kubectl_config_view()
     flags+=("--output=")
     two_word_flags+=("-o")
     flags+=("--output-version=")
+    flags+=("--raw")
     flags+=("--template=")
     two_word_flags+=("-t")