Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to 960971d2b7cb4915925ea37ecc78e484b42d51af
  - Merge "Update Netty Library version"
  - Update Netty Library version
    
    Issue-ID: MUSIC-406
    Signed-off-by: Nelson, Thomas (tn1381) <tn1381@att.com>
    Change-Id: I088f6e727ad10971e245508ba862272d43170080
    
1 file changed