Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to 4771ff0c0b5b68209e29bec88a0b2e566ef50834
  - Merge "Fixed Sonar issues in ZkStatelessLockService"
  - Fixed Sonar issues in ZkStatelessLockService
    
    Fixed potential NullPointerException.
    Added restoring of the interrupted state.
    Removed unnecessary imports.
    Added missing loggers.
    
    Change-Id: I62bb8ef2b4893c60c1cea7dcd4ba29f2908b4d05
    Issue-ID: MUSIC-329
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    
1 file changed