Update git submodules

* Update docs/submodules/joid from branch 'master'
  - modfied heat to use defined encruption key as know issue in heat.

    Change-Id: I40d5682f019072eac594ea58cef5d4a96aa70da7
    Signed-off-by: Narinder Gupta <narinder.gupta@canonical.com>

diff --git a/docs/submodules/joid b/docs/submodules/joid
index 8752ecf..4eb4fdc 160000 (submodule)
--- a/docs/submodules/joid
+++ b/docs/submodules/joid
@@ -1 +1 @@
-Subproject commit 8752ecf2cf91e027bd2f722129ada65fbb8c0183
+Subproject commit 4eb4fdc5f39069f6af63992300f6fbf3e6534853