Actually set verify hostname param and check return code

Test: as follows
    - built
    - flashed
    - booted
    - ./system/netd/tests/runtests.sh passes
      (except already failing BinderTest.TestVirtualTunnelInterface)
Bug: 64133961
Merged-In: Ibbb181ae5d251c2d8a790206b9a79a88ba7d1b3e
Merged-In: Iebd1e56ba81f28b41477a7dfd1941262bd28d644
Change-Id: Ide12b1293977e010ac164c447e2c8491c3a42175
(cherry picked from commit efc13634)