Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 8fda37850448fc0bef11468aee79da0d9b8c9e81
  - update release note for Frankfurt

    APPC release note updated
    for Frankfurt release

    Issue-ID: APPC-1880
    Change-Id: I1bff2a6f8f2d6f032033fb80ccc22796be608823
    Signed-off-by: Taka Cho <takamune.cho@att.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index 0be119c..8fda378 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit 0be119cd1220b346e731daf30bdce0b1b9077da5
+Subproject commit 8fda37850448fc0bef11468aee79da0d9b8c9e81