Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to d6f7963013c9b16552509eb53381baef73740f8f
  - Added test case for Attach volume class
    
    Issue-ID: APPC-1467
    Change-Id: Ifc902979c955df03ab847b4dd770bf737ff69eb9
    Signed-off-by: Lathishbabu Ganesan <lathishbabu.ganesan@ericsson.com>
    
1 file changed