Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 6bf7ea2d90317508b64f74fed91a4b1fe5e781df
  - added file to test CommonMessage.java
    
    to increase code coverage
    
    Issue-ID: APPC-1086
    Change-Id: I4cf3a640031a60a34c829ecb039325d6194fa682
    Signed-off-by: Sandeep J <sandeejh@in.ibm.com>
    
1 file changed