[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
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 9f2ea35..9ecc83c 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -23,6 +23,9 @@
     },
     {
       "name": "TetheringIntegrationTests"
+    },
+    {
+      "name": "traffic_controller_unit_test"
     }
   ],
   "postsubmit": [
@@ -35,6 +38,9 @@
     },
     {
       "name": "libclat_test"
+    },
+    { "name": "traffic_controller_unit_test",
+      "keywords": ["netd-device-kernel-4.9", "netd-device-kernel-4.14"]
     }
   ],
   "mainline-presubmit": [
@@ -51,6 +57,9 @@
     },
     {
       "name": "ConnectivityCoverageTests[CaptivePortalLoginGoogle.apk+NetworkStackGoogle.apk+com.google.android.resolv.apex+com.google.android.tethering.apex]"
+    },
+    {
+      "name": "traffic_controller_unit_test[CaptivePortalLoginGoogle.apk+NetworkStackGoogle.apk+com.google.android.resolv.apex+com.google.android.tethering.apex]"
     }
   ],
   "mainline-postsubmit": [