Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to ad5fadb29be48230145d2d155daf4dc72a5ce450
  - Allow storing db.user and db.pass in environment variables

    This patch allows to store and get db.user and db.pass from
    environment variables. This is needed if we want to send those
    variables by helm secrets.

    Change-Id: I166dbee857c95256fa5253379205c81414771c53
    Issue-ID: OOM-2275
    Signed-off-by: Dominik Mizyn <d.mizyn@samsung.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index 90732f0..ad5fadb 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit 90732f0d7d131cb3a9640cde51b9afdc502a7c4d
+Subproject commit ad5fadb29be48230145d2d155daf4dc72a5ce450