Add support for reading, merging, and querying configs

Change-Id: I04a07cf5e9a6b41213b3101f3e04be350e50b41f
diff --git a/aos/testing/BUILD b/aos/testing/BUILD
index ed410b1..0c214ed 100644
--- a/aos/testing/BUILD
+++ b/aos/testing/BUILD
@@ -8,6 +8,7 @@
     deps = [
         "//third_party/googletest:gtest",
         "@com_github_gflags_gflags//:gflags",
+        "@com_github_google_glog//:glog",
     ],
 )