Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 18ae7612481c386db22fe983dedf331a29141444
  - Refactor CsarUtils::WriteArtifactDefinition
    
    Signed-off-by: Francis Toth <francis.toth@yoppworks.com>
    Change-Id: I167a05d8fbc2085a3e25eeb5bfd6b30f0e80462e
    Issue-ID: SDC-2812
    
1 file changed