Make the tests pass when dot_async_handshake and dot_maxtries are set

Ensure that resolv_integration_test can pass if the flags are set
to some value.

Bug: 149445907
Bug: 120182528
Test: set {dot_async_handshake=1,dot_maxtries=1,dot_connect_timeout_ms=30000}
      and ran atest
Change-Id: If1751f63b6244b8cd49c612ecd56301f32ff5db1