Add libweave's unit tests to autotest

Renamed the test binary to libweave_test to stay consistent with
other Brillo test runner and marked it to be executed as part of
brillo_Gtests test.

BUG: 25672600
Change-Id: If8d5c9228ac67e535d95a3efabb4c1ecd2763683
Reviewed-on: https://weave-review.googlesource.com/1521
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

Android.mk

diff --git a/Android.mk b/Android.mk
index fc7e62b..9833c4b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -169,10 +169,11 @@
 
 include $(BUILD_SHARED_LIBRARY)
 
-# libweave_testrunner
+# libweave_test
 # ========================================================
 include $(CLEAR_VARS)
-LOCAL_MODULE := libweave_testrunner
+LOCAL_MODULE := libweave_test
+LOCAL_MODULE_TAGS := debug
 LOCAL_CPP_EXTENSION := $(libweaveCommonCppExtension)
 LOCAL_CFLAGS := $(libweaveCommonCFlags)
 LOCAL_CPPFLAGS := $(libweaveCommonCppFlags)