kubeadm: Introduce config print init/join-defaults

In order to improve the UX of kubeadm, it was decided to introduce the
following subcommands:

- `kubeadm config print` - this is currently only a placeholder for subcommands
  that deal printing of some kind of configuration.
- `kubeadm config print init-defaults` - prints the default combination of
  InitConfiguration and ClusterConfiguration. Selected component configs can be
  printed too if the `--component-configs` command line switch is used.
- `kubeadm config print join-defaults` - prints the default JoinConfiguration.
  This command also supports the use of `--component-configs`.
- `kubeadm config print-defaults` is deprecated in favor of
  `kubeadm config print init/join-defaults`.

Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>

docs/.generated_docs

@@ -75,7 +75,9 @@ docs/admin/kubeadm_config_images.md
 docs/admin/kubeadm_config_images_list.md
 docs/admin/kubeadm_config_images_pull.md
 docs/admin/kubeadm_config_migrate.md
-docs/admin/kubeadm_config_print-default.md
+docs/admin/kubeadm_config_print.md
+docs/admin/kubeadm_config_print_init-defaults.md
+docs/admin/kubeadm_config_print_join-defaults.md
 docs/admin/kubeadm_config_upload.md
 docs/admin/kubeadm_config_upload_from-file.md
 docs/admin/kubeadm_config_upload_from-flags.md
@@ -172,6 +174,9 @@ docs/man/man1/kubeadm-config-images-pull.1
 docs/man/man1/kubeadm-config-images.1
 docs/man/man1/kubeadm-config-migrate.1
 docs/man/man1/kubeadm-config-print-default.1
+docs/man/man1/kubeadm-config-print-init-defaults.1
+docs/man/man1/kubeadm-config-print-join-defaults.1
+docs/man/man1/kubeadm-config-print.1
 docs/man/man1/kubeadm-config-upload-from-file.1
 docs/man/man1/kubeadm-config-upload-from-flags.1
 docs/man/man1/kubeadm-config-upload.1

docs/admin/kubeadm_config_print_init-defaults.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubeadm_config_print_join-defaults.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-config-print-init-defaults.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-config-print-join-defaults.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-config-print.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.