Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 4c2899ac39fede0c276a58469ac53eecc776a028
  - Improve OJSI-185 documentation

    Add some more details why we no longer consider OJSI-185 as a security
    issue.

    Issue-ID: OJSI-185
    Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
    Change-Id: Ifd8a9c42abab82e56a7f87891f0d1a3491b92e6e
    (cherry picked from commit 8dfcaf2db45f4145e2bcd5c0eec669e294fa0f6a)

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index a5132c7..4c2899a 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit a5132c7911505f48628ad4782d617d36a9cd085e
+Subproject commit 4c2899ac39fede0c276a58469ac53eecc776a028