Add all CTS tests to VTS, to improve VTS coverage.
b/62423436.

This CL was generated using the following command:
master/cts$ grep -rl "LOCAL_COMPATIBILITY_SUITE := cts" . | \
xargs sed -i \
's/LOCAL_COMPATIBILITY_SUITE := cts/LOCAL_COMPATIBILITY_SUITE := cts vts/g'

Based on change: d98ea4bc2a2042334d144a4a8f403ec13cb39e4d

Test: make vts -j32
Verified VTS output contained the CTS test case source code.

Change-Id: Id52ac1639447276171006c33bdfa7b4e6c874745
diff --git a/tests/cts/net/Android.mk b/tests/cts/net/Android.mk
index 3493ccb..4aeab38 100644
--- a/tests/cts/net/Android.mk
+++ b/tests/cts/net/Android.mk
@@ -47,7 +47,7 @@
 #LOCAL_SDK_VERSION := current
 
 # Tag this module as a cts test artifact
-LOCAL_COMPATIBILITY_SUITE := cts general-tests
+LOCAL_COMPATIBILITY_SUITE := cts vts general-tests
 
 include $(BUILD_CTS_PACKAGE)