Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to a7c2d9c05b86c797cd2df007ca7c461b9956b47b
  - added test file to cover ResponseKey.java
    
    to increase code coverage
    
    Issue-ID: APPC-1086
    Change-Id: I7408e9eeda6f52f6ba3aae437ca75c3647d97de0
    Signed-off-by: Sandeep J <sandeejh@in.ibm.com>
    
1 file changed