Update connectivity TEST_MAPPING

- Move Tethering TEST_MAPPING up one level to merge with the general
   Connectivity TEST_MAPPING. This allows running the tethering tests
   on any connectivity change.
 - Move TetheringIntegrationTests from postsubmit to presubmit
 - Add TetheringCoverageTests to mainline-postsubmit, so it can be
   added to mainline-presubmit later.
 - Import NetworkStack tests so that they are run on any connectivity
   change.

TetheringIntegrationTests were continuously green in postsubmit.

Bug: 187946226
Original-Change: https://android-review.googlesource.com/1713468
Merged-In: Ibf05ad64b02c563930ba0f01eb91331b295fe505
Change-Id: Ibf05ad64b02c563930ba0f01eb91331b295fe505
Test: Treehugger needed to test TEST_MAPPING files

TEST_MAPPING

@@ -11,6 +11,12 @@
           "exclude-annotation": "com.android.testutils.SkipPresubmit"
         }
       ]
+    },
+    {
+      "name": "TetheringTests"
+    },
+    {
+      "name": "TetheringIntegrationTests"
     }
   ],
   "mainline-presubmit": [
@@ -24,11 +30,19 @@
       ]
     }
   ],
-  // Tests on physical devices with SIM cards: postsubmit only for capacity constraints
   "mainline-postsubmit": [
+    // Tests on physical devices with SIM cards: postsubmit only for capacity constraints
     {
       "name": "CtsNetTestCasesLatestSdk[CaptivePortalLoginGoogle.apk+NetworkStackGoogle.apk+com.google.android.resolv.apex+com.google.android.tethering.apex]",
       "keywords": ["sim"]
+    },
+    {
+      "name": "TetheringCoverageTests[CaptivePortalLoginGoogle.apk+NetworkStackGoogle.apk+com.google.android.resolv.apex+com.google.android.tethering.apex]"
+    }
+  ],
+  "imports": [
+    {
+      "path": "packages/modules/NetworkStack"
     }
   ],
   "imports": [

Tethering/TEST_MAPPING

@@ -1,12 +0,0 @@
-{
-  "presubmit": [
-    {
-      "name": "TetheringTests"
-    }
-  ],
-  "postsubmit": [
-    {
-      "name": "TetheringIntegrationTests"
-    }
-  ]
-}