Merge pull request kubernetes#53249 from hzxuzhonghu/envelop-encrypt

Automatic merge from submit-queue (batch tested with PRs 53249, 53586). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

rename encryptionconfig_test.go and remove unused filed in envelopeTransformer

**What this PR does / why we need it**:
useless field `cacheSize` and rename test file match original `config.go`.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

Author: Kubernetes Submit Queue

staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/BUILD

@@ -27,7 +27,7 @@ go_library(
 
 go_test(
     name = "go_default_test",
-    srcs = ["encryptionconfig_test.go"],
+    srcs = ["config_test.go"],
     library = ":go_default_library",
     deps = [
         "//vendor/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",

staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/encryptionconfig_test.go renamed to staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/config_test.go

@@ -46,9 +46,6 @@ type envelopeTransformer struct {
 	// transformers is a thread-safe LRU cache which caches decrypted DEKs indexed by their encrypted form.
 	transformers *lru.Cache
 
-	// cacheSize is the maximum number of DEKs that are cached.
-	cacheSize int
-
 	// baseTransformerFunc creates a new transformer for encrypting the data with the DEK.
 	baseTransformerFunc func(cipher.Block) value.Transformer
 }
@@ -68,7 +65,6 @@ func NewEnvelopeTransformer(envelopeService Service, cacheSize int, baseTransfor
 	return &envelopeTransformer{
 		envelopeService:     envelopeService,
 		transformers:        cache,
-		cacheSize:           cacheSize,
 		baseTransformerFunc: baseTransformerFunc,
 	}, nil
 }