Add imports to networking test mapping

Ensure that appropriate networking tests are triggered when submitting
changes in the frameworks/base directories.

Change-Id: Ibf8b567fa7721299120b0a6c6836dd770d92a9fc
Test: treehugger runs TEST_MAPPING tests
diff --git a/tests/net/TEST_MAPPING b/tests/net/TEST_MAPPING
index 005cbe9..89fc6ea 100644
--- a/tests/net/TEST_MAPPING
+++ b/tests/net/TEST_MAPPING
@@ -8,5 +8,10 @@
     {
       "name": "FrameworksNetDeflakeTest"
     }
+  ],
+  "imports": [
+    {
+      "path": "cts/tests/tests/net"
+    }
   ]
 }
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