Update git submodules

* Update docs/submodules/moon from branch 'master'
  - Add unittests for moon_authz

    Change-Id: Ic6ca3f2daa122ab030b29eee45d63fb7eb8abd64

diff --git a/docs/submodules/moon b/docs/submodules/moon
index 2c1d6d4..21bccb7 160000 (submodule)
--- a/docs/submodules/moon
+++ b/docs/submodules/moon
@@ -1 +1 @@
-Subproject commit 2c1d6d454a1df6b7dd1d1b6601ed02f7a33eefb9
+Subproject commit 21bccb742f6a819d582f1b15032f2a9ce8bab871