Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to d4d78908d359635b860b900598a5627bf6e7945d
  - Merge "added file to test PreparedQueryObject"
  - added file to test PreparedQueryObject
    
    to increase code coverage
    
    Issue-ID: MUSIC-412
    Change-Id: Id231f3b0f122d9b9e95988a45eb8cd18ecdb0136
    Signed-off-by: Sandeep J <sandeejh@in.ibm.com>
    
1 file changed