Remove the resolv_integration_test check whether fd is closed or not am: b3505420 am: c85e73d6 am: 098091a6 am: 107e1163

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/1461803

Change-Id: Id7631f930307bca9b6e7f41913991fdb0bd19fb0