Moved client and kubeconfig related code to webhook/config;
Moved the rule matcher to webhook/rules;
Left TODOs saying we are going to move some other common utilities;
Other code is moved to webhook/validation.
Kubernetes-commit: 1adfacc7eb41da109e970a9c2985fd55b4cbbdfd
move k8s.io/kubernetes/plugin/pkg/admission/initialization to
k8s.io/apiserver/pkg/admission/plugin/initialization/initialization.go;
move k8s.io/kubernetes/pkg/kubeapiserver/admission/configuration to
k8s.io/apiserver/pkg/admission/configuration.
Kubernetes-commit: 89a0511fcb22caf23427587c026952b2a387f293
lifecycle plugin: make use of the libraries under k8s.io/client-go/pkg/api and k8s.io/client-go/kubernetes
for the client libraries instead of k8s.io/kubernetes/client/*
move registration to AdmissionOptions
Kubernetes-commit: 77eb2f39500f1fcf66899ea557791e7bca851449
Jordan Liggitt
Chao Xu
David Eads
p0lyn0mial