Fix libs/net tests package

Move test classes that were not in the same com.android.module.util
package as their associated class into the right package, and make
net-utils-service-common visible to tests.

Bug: 207020032
Test: atest ConnectivityCoverageTests
Change-Id: Iabe86a7d4c2437b3d01d68d53fb01d4e3c05a02b
diff --git a/staticlibs/Android.bp b/staticlibs/Android.bp
index 6a56889..fde9d3e 100644
--- a/staticlibs/Android.bp
+++ b/staticlibs/Android.bp
@@ -213,6 +213,7 @@
     ],
     visibility: [
         "//frameworks/base/services/net",
+        "//packages/modules/Connectivity/tests:__subpackages__",
     ],
 }