Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 38ff7fdacf2d2e37cfa89f8e19f6375c6d216bc8
  - ExecuteNodeActionImpl is not instatiate
    
    Remove getVersionRelation
    back to getVnfHierachy
    
    Change-Id: Ia5c837bd6a75eb6397959f260a89cc5466ce3e42
    Issue-ID: APPC-1542
    Signed-off-by: Taka Cho <takamune.cho@att.com>
    
diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index 5ec07f4..38ff7fd 160000
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit 5ec07f4ebb488d30ba316019f4d3dd9ddf3cc30d
+Subproject commit 38ff7fdacf2d2e37cfa89f8e19f6375c6d216bc8