Update git submodules

* Update docs/submodules/joid from branch 'master'
  - making default series to xenial.

    Change-Id: I26dfb8941e7b00717121dac3f1b3ecb26d8210bb
    Signed-off-by: Narinder Gupta <narinder.gupta@canonical.com>

diff --git a/docs/submodules/joid b/docs/submodules/joid
index ff57b17..5235de0 160000 (submodule)
--- a/docs/submodules/joid
+++ b/docs/submodules/joid
@@ -1 +1 @@
-Subproject commit ff57b174656b762b465d745d5f462484409e147b
+Subproject commit 5235de0b3205b6d7e9c63cc85600927226a755d6