Update git submodules

* Update docs/submodules/joid from branch 'master'
  - modified to setup contraints on single bindin space charms.

    Change-Id: Ied886a0865a637ac206a831c7ce98933c600e5e7
    Signed-off-by: Narinder Gupta <narinder.gupta@canonical.com>

diff --git a/docs/submodules/joid b/docs/submodules/joid
index 1e9212b..273b2b9 160000 (submodule)
--- a/docs/submodules/joid
+++ b/docs/submodules/joid
@@ -1 +1 @@
-Subproject commit 1e9212b4472421d774119a49cbfb803799032d0a
+Subproject commit 273b2b957d709603a356989cbae19352bd920037