Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 76c431ff25d09b69ea912f53ca96cbcdcb52a3fb
  - Fix for timeout error when logging >1MB data

    Potentially large logs moved to TRACE level, INFO level
    logs limited in size and related tests updated

    Issue-ID: APPC-1489
    Change-Id: I9ea85e64380479d835da03ed2af3e4ab96ece67e
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index d6f7963..76c431f 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit d6f7963013c9b16552509eb53381baef73740f8f
+Subproject commit 76c431ff25d09b69ea912f53ca96cbcdcb52a3fb