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

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

Change-Id: Id5cfe8648ca25d3d48e3ccc6e614ced902358673