Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to 021bf79c3a37acc0121b4b18b63f572d8ac9dd7e
  - Merge "Remove this unused logger private field Issue-ID: MUSIC-523 Change-Id: Idabaaf20bfb243598db30a6985eedb411b2cd2b7 Signed-off-by: manisha07 <cmanis10@in.ibm.com>"
  - Remove this unused logger private field
    Issue-ID: MUSIC-523
    Change-Id: Idabaaf20bfb243598db30a6985eedb411b2cd2b7
    Signed-off-by: manisha07 <cmanis10@in.ibm.com>

diff --git a/docs/submodules/music.git b/docs/submodules/music.git
index 48b02df..021bf79 160000 (submodule)
--- a/docs/submodules/music.git
+++ b/docs/submodules/music.git
@@ -1 +1 @@
-Subproject commit 48b02dfdc78a6412d568a14b015ccb9439a1dbb5
+Subproject commit 021bf79c3a37acc0121b4b18b63f572d8ac9dd7e