Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 2f156e88b2c433ee2d3c404c1595f174ce13f878
  - Improved unit tests for the DaoUtils class.
    
    Issue-ID: SDC-2327
    Signed-off-by: Krystian Kedron <k.kedron@partner.samsung.com>
    Change-Id: I634fc1ccccbfa5b1fec5f2612782f00990438c6b
    
1 file changed