Update git submodules

* Update docs/submodules/joid from branch 'master'
  - Merge "Rename juju run --service flag to --application"
  - Rename juju run --service flag to --application

    This flag has been renamed in (probably) Juju 2.0.
    For reference, compare documentation for `juju run` command in
    https://jujucharms.com/docs/1.25/commands and
    https://jujucharms.com/docs/2.0/commands

    The `--service` flag causes the `openstack.sh` to fail and exit,
    skipping important functionality.

    Change-Id: Ia5b3f5c29622de2caabee9832aa6920932c43656
    Signed-off-by: Martin Kulhavy <martin.kulhavy@nokia.com>

diff --git a/docs/submodules/joid b/docs/submodules/joid
index 2f823d9..4df6477 160000 (submodule)
--- a/docs/submodules/joid
+++ b/docs/submodules/joid
@@ -1 +1 @@
-Subproject commit 2f823d98d676b0465c01361f1ba942d14a3e974c
+Subproject commit 4df6477f0b8b92ef6da1cd84a17d51b3e6ea31bb