Prepare for removal of legacy-test from default targets

In preparation for removing junit classes from the Android API
the legacy-test target will be removed from the
TARGET_DEFAULT_JAVA_LIBRARIES. This change adds explicit
dependencies on junit and/or legacy-android-test to ensure that
modules will compile properly once it is removed.

Bug: 30188076
Test: make checkbuild
Change-Id: I0f34fe97154240e8f8eef6816df1c794da60351e

tests/cts/net/Android.mk

@@ -34,8 +34,14 @@ LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
 LOCAL_PACKAGE_NAME := CtsNetTestCases
 
-LOCAL_STATIC_JAVA_LIBRARIES := core-tests-support  compatibility-device-util \
-                               ctstestrunner ctstestserver mockwebserver
+LOCAL_STATIC_JAVA_LIBRARIES := \
+    core-tests-support \
+    compatibility-device-util \
+    ctstestrunner \
+    ctstestserver \
+    mockwebserver \
+    junit \
+    legacy-android-test
 
 # uncomment when b/13249961 is fixed
 #LOCAL_SDK_VERSION := current