Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 74a340555461715c177df449ca357449ec9f11ed
  - Created constant to replace dup String literal
    
    Sonar fix
    
    Issue-ID: APPC-1554
    Change-Id: I8ff882baf26e765b9b8bcf23bcc37b11a3567ded
    Signed-off-by: Jegadeesh Babu <jegabab1@in.ibm.com>
    
diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index e31159c..74a3405 160000
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit e31159c2410ae360d23346c593d63106e317d972
+Subproject commit 74a340555461715c177df449ca357449ec9f11ed