Updated git submodules

Project: appc master f8f6d212382f458e1cb31081dad744e78f92e521

Decouple ChefApiClientImpl from header creation

Introduce new FunctionalInterface HttpHeaderFactory to allow customization of
http header providers when creating ChefApiClientImpl using ChefApiClientFactory
This allows for better encapsulation of header specific values such as:
userId,organizations,pemPath.

Change-Id: Iec2c7cff8e664a18e15d7e973920152fdb158c98
Issue-ID: APPC-437
Signed-off-by: Michal Kabaj <michal.kabaj@nokia.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index 20eaa8a..f8f6d21 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit 20eaa8a699ea41b7c40bbee7364dd3554af45606
+Subproject commit f8f6d212382f458e1cb31081dad744e78f92e521