Update git submodules

Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to dd899213724ceaab3bb141dfb5cbf4eb7b89404a
  - Merge changes from topic 'sudars_19_music_291_1'

    * changes:
      MusicServiceException-Junit test cases added
      MusicQueryException - Junit Test Case Added

  - MusicServiceException-Junit test cases added

    MusicServiceException-Junit test cases added

    Issue-ID: MUSIC-293
    Change-Id: I101a1efc50a0e34d4610e8821f50e6e426849bff
    Signed-off-by: Sudarshan Kumar <sudars19@in.ibm.com>
  - MusicQueryException - Junit Test Case Added

    MusicQueryException - Junit Test Case Added

    Issue-ID: MUSIC-292
    Change-Id: I7211cd1d714707370ba4c676b5a78f4772336905
    Signed-off-by: Sudarshan Kumar <sudars19@in.ibm.com>