Remove the resolv_integration_test check whether fd is closed or not am:...

Remove the resolv_integration_test check whether fd is closed or not am: b3505420 am: 4e718b8e am: 3b4e659a am: e4d554a3

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

Change-Id: Ifbeb83c264011e92478b06b45a491142eb861c6e