[NETD-TC#13] Make TrafficControllerTest as traffic_controller_unit_test

Delete tagSocket(), privilegedTagSocket() and untagSocket() revelant
test cases since thay are moved out of TrafficController in
aosp/1849156.

Bug: 202086915
Test: atest traffic_controller_unit_test passed
Change-Id: I605577ee4d7076f0c8ad75888a4d32bff90f6104
3 files changed