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: c85e73d6 am: 737c167d

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

Change-Id: Ic6ea11960ce7272f364611fc80415e53b004a069