Move net unit tests to packages/Connectivity

Move the tests together with packages/Connectivity code, so both can be
moved to packages/modules/Connectivity together.

Also reorganize unit tests in a unit/ directory, as other tests
(integration/, common/ etc.) have been added in tests/net since they
were created. This makes the directory structure consistent.

Test: atest FrameworksNetTests
Bug: 187814163
Merged-In: I254ffd1c08ec058d594b4ea55cbae5505f8497cc

Change-Id: I254ffd1c08ec058d594b4ea55cbae5505f8497cc
diff --git a/tests/unit/jarjar-rules.txt b/tests/unit/jarjar-rules.txt
new file mode 100644
index 0000000..ca88672
--- /dev/null
+++ b/tests/unit/jarjar-rules.txt
@@ -0,0 +1,2 @@
+# Module library in frameworks/libs/net
+rule com.android.net.module.util.** android.net.frameworktests.util.@1