Stop statically including legacy-android-test

Statically including legacy-android-test leads to duplicate classes
which causes build time problems (with Proguard) and runtime problems on
older SDK versions. This change:
* Stops statically including legacy-android-test.
* Adds compile time dependencies on andoid.test.base, android.test.mock
  and android.test.runner where necessary.
* Adds <uses-library android:name="android.test.runner"/> to any
  affected package to ensure that the classes that were included by
  legacy-android-test are still available at runtime. That also adds a
  dependency on android.test.base and android.test.mock.

The following change descriptions were generated automatically and so
may be a little repetitive. They are provided to give the reviewer
enough information to check the comments match what has actually been
changed and check the reasoning behind the changes.

* tests/unit/Android.mk
    Added 'android.test.base' and 'android.test.mock' to
    LOCAL_JAVA_LIBRARIES because SettingsUnitTests's source depends on
    their classes and because of these changes they are no longer
    present on the compilation path.

    Removed legacy-android-test from LOCAL_STATIC_JAVA_LIBRARIES
    because statically including the classes in SettingsUnitTests
    results in duplicate classes which leads to build time and compile
    time issues.

Bug: 30188076
Test: make checkbuild
Change-Id: I191a72e50017213df6ad04f32aa660e8028720e2
diff --git a/tests/unit/Android.mk b/tests/unit/Android.mk
index 58fe7dd..cbf91db 100644
--- a/tests/unit/Android.mk
+++ b/tests/unit/Android.mk
@@ -5,14 +5,19 @@
 LOCAL_MODULE_TAGS := tests
 LOCAL_CERTIFICATE := platform
 
-LOCAL_JAVA_LIBRARIES := android.test.runner telephony-common ims-common
+LOCAL_JAVA_LIBRARIES := \
+    android.test.runner \
+    telephony-common \
+    ims-common \
+    android.test.base \
+    android.test.mock \
+
 
 LOCAL_STATIC_JAVA_LIBRARIES := \
     android-support-test \
     espresso-core \
     espresso-contrib-nodep \
     espresso-intents-nodep \
-    legacy-android-test \
     mockito-target-minus-junit4 \
     platform-test-annotations \
     truth-prebuilt \