Cleanup util/config packages; filenames and methods should be updated to use new names

[fabriziopandini]

Package k8s.io/kubernetes/cmd/kubeadm/app/util/config/ contains a set of function for dealing with kubeadm config files.

Filenames and methods name should be now updated to use new names of the kubeadm config types. e.g.:
MasterConfiguration --> InitConfiguration
NodeConfiguration --> JoinConfiguration

[fabriziopandini]

/lifecycle active
/assign @RA489

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/lifecycle active
/assign @RA489

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[RA489]

@fabriziopandini I want to take this.

[fabriziopandini]

@RA489 as agreed more detail on this issue. Feel free to add your ideas on top 😉

In v1.12 kubeadm config file (defined in the kubeadm/app/apis folder) transitioned from v1alpha2 to v1alpha3; this transition included also renaming of some types e.g.

v1alpha2.MasterConfiguration --> v1alpha3.InitConfiguration
v1alpha2.NodeConfiguration --> v1alpha3.JoinConfiguration

This issue aims to cleanup the codebase - file names and method names - from remaining references to old names (MasterConfiguration, NodeConfiguration), replacing them with new names (InitConfiguration, JoinConfiguration); please note that in the code base there are also yaml fragments that use old names; such yaml files SHOULD NOT be changed because they are used to test conversions of kubeadm config files written using old api versions.

File names that should be fixed are:

• /kubeadm/app/util/config/masterconfig.go --> initconfiguration.go
• /kubeadm/app/util/config/masterconfig_test.go --> initconfiguration_test.go
• /kubeadm/app/util/config/nodeconfig.go --> joinconfiguration.go
• /kubeadm/app/util/config/nodeconfig_test.go --> joinconfiguration_test.go

Method names that should be fixed are:

in /kubeadm/app/util/config/nodeconfig.go

• NodeConfigFileAndDefaultsToInternalConfig -> JoinConfigFileAndDefaultsToInternalConfig

in /kubeadm/app/util/config/nodeconfig_test.go

• TestNodeConfigFileAndDefaultsToInternalConfig -> TestJoinConfigFileAndDefaultsToInternalConfig

All references to the above methods should be fixed as well.