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/googlemock/docs/Documentation.md

@@ -0,0 +1,15 @@
+This page lists all documentation markdown files for Google Mock **(the
+current git version)**
+-- **if you use a former version of Google Mock, please read the
+documentation for that specific version instead (e.g. by checking out
+the respective git branch/tag).**
+
+  * [ForDummies](ForDummies.md) -- start here if you are new to Google Mock.
+  * [CheatSheet](CheatSheet.md) -- a quick reference.
+  * [CookBook](CookBook.md) -- recipes for doing various tasks using Google Mock.
+  * [FrequentlyAskedQuestions](FrequentlyAskedQuestions.md) -- check here before asking a question on the mailing list.
+
+To contribute code to Google Mock, read:
+
+  * [CONTRIBUTING](../CONTRIBUTING.md) -- read this _before_ writing your first patch.
+  * [Pump Manual](../../googletest/docs/PumpManual.md) -- how we generate some of Google Mock's source files.