Update git submodules

Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to d6e7b63cc580e7b3822be61fe92a493ad5e222a3
  - Changes Listed below:

    - Added build version API
    - Updated Keyspace active to use Properties setting
    - Update Libraries Netty,jbcrypt,Jackson Databind and log4j
    - Removed some irrelivant files
    - Updated some usint tests to ignore some tests(This will be updated soon)
    - Bugfixes
      - Missing Values, inform user.
      - Respond with proper error
      - Fix Locking Contention issue.
      - Add locking retry for atomic calls.

    Change-Id: Ie218dd92edb0c20e4a0efe33eeaaec84e5293c44
    Issue-ID: MUSIC-393
    Signed-off-by: Nelson, Thomas (arthurdent3) <nelson24@att.com>