Fix CTS Test Dual Stack Test Passing Issue

CTS test should fail if IPV6 Sockets is used on IPV4 address.
Unfortunately its been passing fine due to unhandled catch
exception. This is fixed in this CL.

Bug: 64435904
Test: Ran CTS test to verify ./run_cts.sh
Change-Id: I369c1b5baaa64b64feaa3f298e61f46d1200ea17