Add Google test based tests.

Initial testing include an "id test", which really just a
template test at this point, and a temperature sensor test.

The google test code is included in this commit. It will
eventually be taken out and replaced with a pull from a google
external repo.

Change-Id: I591818a9c169f4654fc8d8f17cf648f227d72545

tests/rdc_tests/gtest/Makefile.am

@@ -0,0 +1,14 @@
+## Process this file with automake to produce Makefile.in
+ACLOCAL_AMFLAGS = -I m4
+
+AUTOMAKE_OPTIONS = foreign
+
+# Build . before src so that our all-local and clean-local hooks kicks in at
+# the right time.
+SUBDIRS = googletest googlemock
+
+EXTRA_DIST = \
+  BUILD.bazel \
+  CMakeLists.txt \
+  README.md \
+  WORKSPACE