Update git submodules

* Update docs/submodules/moon from branch 'master'
  - Merge "Add unit tests for moon_db"
  - Add unit tests for moon_db

    Change-Id: I98c18e696bd9dffe8c0ccc62df6c5210d78b4ab4

diff --git a/docs/submodules/moon b/docs/submodules/moon
index 9ba538b..fe8cf8d 160000 (submodule)
--- a/docs/submodules/moon
+++ b/docs/submodules/moon
@@ -1 +1 @@
-Subproject commit 9ba538bba8e2e9a3528ad0a055f8bfdc886e4429
+Subproject commit fe8cf8dcabfcd223e8661f3af8ac02f4e6b1e708