Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 3188cd1b2770159eca5de4fbb64a5d1c90aa803e
  - Added Junit Class for CallableConsumer.java
    
    Added Junit Class for CallableConsumer.java
    
    Issue-ID: APPC-1372
    Change-Id: I3bdf3b66cf3c54835a9bf74076c47767ed03c1b0
    Signed-off-by: Sudarshan Kumar <sudars19@in.ibm.com>
    
1 file changed