Update git submodules

* Update storlets from branch 'master'
  to cb615e59418bbe24f6c32b6d2f54e2e6e2ae4d3c
  - Run storlet application in proxy for EC objects

    When the target object is an EC object, we can't read the whole data
    in object servers.

    Change-Id: I6d9a4cd97c647f22896bd5ae8ab26d7d55d76860
    Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

diff --git a/storlets b/storlets
index 207020fc2bb5a0ccf584362c472ccb3487ff3102..cb615e59418bbe24f6c32b6d2f54e2e6e2ae4d3c 160000 (submodule)
--- a/storlets
+++ b/storlets
@@ -1 +1 @@
-Subproject commit 207020fc2bb5a0ccf584362c472ccb3487ff3102
+Subproject commit cb615e59418bbe24f6c32b6d2f54e2e6e2ae4d3c