Update git submodules

* Update docs/submodules/music.git from branch 'master'
  to 871909a6f7f6899d0aa2df902be7df2696fd9280
  - Merge "Log exceptions from CachingUtil.java"
  - Log exceptions from CachingUtil.java

    Fixed critical sonar issues:
    -log exceptions stack traces
    -fixed imports.

    Change-Id: I4fc3c79852cd0c483abef975bcd7e535f3de48f3
    Issue-ID: MUSIC-366
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>

diff --git a/docs/submodules/music.git b/docs/submodules/music.git
index 49b246b..871909a 160000 (submodule)
--- a/docs/submodules/music.git
+++ b/docs/submodules/music.git
@@ -1 +1 @@
-Subproject commit 49b246be830cbd35125fb9eb2054ed60139f996c
+Subproject commit 871909a6f7f6899d0aa2df902be7df2696fd9280