VAULT-24452: audit refactor (#26460)

* Refactor audit code into audit package
* remove builtin/audit
* removed unrequired files

command/audit_enable_test.go

@@ -4,7 +4,6 @@
 package command
 
 import (
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -169,26 +168,12 @@ func TestAuditEnableCommand_Run(t *testing.T) {
 		client, closer := testVaultServerAllBackends(t)
 		defer closer()
 
-		files, err := ioutil.ReadDir("../builtin/audit")
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		var backends []string
-		for _, f := range files {
-			if f.IsDir() {
-				backends = append(backends, f.Name())
-			}
-		}
-
-		for _, b := range backends {
+		for name := range auditBackends {
 			ui, cmd := testAuditEnableCommand(t)
 			cmd.client = client
 
-			args := []string{
-				b,
-			}
-			switch b {
+			args := []string{name}
+			switch name {
 			case "file":
 				args = append(args, "file_path=discard")
 			case "socket":
@@ -199,15 +184,10 @@ func TestAuditEnableCommand_Run(t *testing.T) {
 					t.Log("skipping syslog test on WSL")
 					continue
 				}
-				if os.Getenv("CIRCLECI") == "true" {
-					// TODO install syslog in docker image we run our tests in
-					t.Log("skipping syslog test on CircleCI")
-					continue
-				}
 			}
 			code := cmd.Run(args)
 			if exp := 0; code != exp {
-				t.Errorf("type %s, expected %d to be %d - %s", b, code, exp, ui.OutputWriter.String()+ui.ErrorWriter.String())
+				t.Errorf("type %s, expected %d to be %d - %s", name, code, exp, ui.OutputWriter.String()+ui.ErrorWriter.String())
 			}
 		}
 	})