Merge pull request #15801 from ioito/automated-cherry-pick-of-#15800-upstream-release-3.10

Automated cherry pick of #15800: fix(mcclient): 避免休眠后再次启动后admin token失效, 导致用户登录失败

pkg/mcclient/auth/auth.go

@@ -331,6 +331,9 @@ func Client() *mcclient.Client {
 }
 
 func AdminCredential() mcclient.TokenCredential {
+	if manager.adminCredential.GetExpires().Before(time.Now()) {
+		manager.reAuth()
+	}
 	return manager.adminCredential
 }