Automatic merge from submit-queue
Remove defaults from string flags
- The default is printed automatically
- The string text did not match the actual default
**What this PR does / why we need it**:
Adjust the documentation for flags on `client-gen`.
**Special notes for your reviewer**:
Doc change. String text only.
**Release note**:
```release-note
NONE
```
Before:
```
client-gen --help
Usage of ./client-gen:
--build-tag string A Go build tag to use to identify files generated by this command. Should be unique. (default "ignore_autogenerated")
--clientset-api-path string the value of default API path.
-n, --clientset-name string the name of the generated clientset package. (default "internalclientset")
--clientset-only when set, client-gen only generates the clientset shell, without generating the individual typed clients
--clientset-path string the generated clientset will be output to <clientset-path>/<clientset-name>. Default to "k8s.io/kubernetes/pkg/client/clientset_generated/" (default "k8s.io/kubernetes/pkg/client/clientset_generated/")
--fake-clientset when set, client-gen will generate the fake clientset that can be used in tests (default true)
-h, --go-header-file string File containing boilerplate header text. The string YEAR will be replaced with the current 4-digit year. (default "/Users/mhb/go/src/k8s.io/gengo/boilerplate/boilerplate.go.txt")
--included-types-overrides stringSlice list of group/version/type for which client should be generated. By default, client is generated for all types which have genclient=true in types.go. This overrides that. For each groupVersion in this list, only the types mentioned here will be included. The default check of genclient=true will be used for other group versions.
--input stringSlice group/versions that client-gen will generate clients for. At most one version per group is allowed. Specified in the format "group1/version1,group2/version2...". Default to "api/,extensions/,autoscaling/,batch/,rbac/" (default [api/,authentication/,authorization/,autoscaling/,batch/,certificates/,extensions/,rbac/,storage/,apps/,policy/])
--input-base string base path to look for the api group. Default to "k8s.io/kubernetes/pkg/apis" (default "k8s.io/kubernetes/pkg/apis")
-i, --input-dirs stringSlice Comma-separated list of import paths to get input types from.
-o, --output-base string Output base; defaults to $GOPATH/src/ or ./ if $GOPATH is not set. (default "/Users/mhb/go/src")
-O, --output-file-base string Base name (without .go suffix) for output files.
-p, --output-package string Base package path.
-t, --test set this flag to generate the client code for the testdata
--verify-only If true, only verify existing output, do not write anything.
```
After:
```
client-gen --help
Usage of ./client-gen:
--build-tag string A Go build tag to use to identify files generated by this command. Should be unique. (default "ignore_autogenerated")
--clientset-api-path string the value of default API path.
-n, --clientset-name string the name of the generated clientset package. (default "internalclientset")
--clientset-only when set, client-gen only generates the clientset shell, without generating the individual typed clients
--clientset-path string the generated clientset will be output to <clientset-path>/<clientset-name>. (default "k8s.io/kubernetes/pkg/client/clientset_generated/")
--fake-clientset when set, client-gen will generate the fake clientset that can be used in tests (default true)
-h, --go-header-file string File containing boilerplate header text. The string YEAR will be replaced with the current 4-digit year. (default "/Users/mhb/go/src/k8s.io/gengo/boilerplate/boilerplate.go.txt")
--included-types-overrides stringSlice list of group/version/type for which client should be generated. By default, client is generated for all types which have genclient=true in types.go. This overrides that. For each groupVersion in this list, only the types mentioned here will be included. The default check of genclient=true will be used for other group versions.
--input stringSlice group/versions that client-gen will generate clients for. At most one version per group is allowed. Specified in the format "group1/version1,group2/version2...". (default [api/,authentication/,authorization/,autoscaling/,batch/,certificates/,extensions/,rbac/,storage/,apps/,policy/])
--input-base string base path to look for the api group. (default "k8s.io/kubernetes/pkg/apis")
-i, --input-dirs stringSlice Comma-separated list of import paths to get input types from.
-o, --output-base string Output base; defaults to $GOPATH/src/ or ./ if $GOPATH is not set. (default "/Users/mhb/go/src")
-O, --output-file-base string Base name (without .go suffix) for output files.
-p, --output-package string Base package path.
-t, --test set this flag to generate the client code for the testdata
--verify-only If true, only verify existing output, do not write anything.
```
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