Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 9a6cfb5790453ae39343c50b21269153b87b06ed
  - Adhered serializable class contracts
    
    Marked member transient
    
    Issue-ID: APPC-1634
    Change-Id: I7bbbf941e692c2755122f3d40a7ca79c59f21749
    Signed-off-by: jegadeeshbabu1 <jegabab1@in.ibm.com>
    
1 file changed