Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 57102888658f02a22c0d9da7872fc7c5880366a1
  - Increase coverage in workflow.activator package
    
    From 32% to 85%
    
    Issue-ID: APPC-1408
    Change-Id: I52447e5df9fd3a6ebdb257dbba9a83013bad6f05
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>
    
1 file changed