Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to de4fcf5171fcc7713b83722906ca4364d253abe8
  - Test coverage in FlowControlNode
    
    Increase line coverage from 72% to 92%
    Fix for Sonar major issue for branch coverage
    
    Issue-ID: APPC-1499
    Change-Id: Ie73b6c97fcf50421ca6a73a8273c09ace0faf67f
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>
    
diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index 9246167..de4fcf5 160000
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit 924616740bdf5f596bd6f32dac32c1a8e5504650
+Subproject commit de4fcf5171fcc7713b83722906ca4364d253abe8