Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 0068db3f75dab58af0fdbf61089794373550feb8
  - increasing test coverage in common-app-api common catalog
    
    Issue-ID: SDC-2326
    Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
    Change-Id: Ida905fc6f0f28d75522c865d33abf636c1fb7fdb
    
1 file changed