Update git submodules

* Update docs/submodules/policy/distribution.git from branch 'master'
  to c82614f968fb7941f7778873afa3bfad51ffd42f
  - Gracefully release resource in file reception plugin

    In the FileSystemReception plugin, we need to shutdown the thread pool
    to release the resources gracefully.

    Change-Id: I800e4070d7bf8c052d964139117a68dc48c50f76
    Issue-ID: POLICY-1631
    Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>

diff --git a/docs/submodules/policy/distribution.git b/docs/submodules/policy/distribution.git
index 87f5140..c82614f 160000 (submodule)
--- a/docs/submodules/policy/distribution.git
+++ b/docs/submodules/policy/distribution.git
@@ -1 +1 @@
-Subproject commit 87f514006bc79fa977a9924039e0f5b8e70a9e6b
+Subproject commit c82614f968fb7941f7778873afa3bfad51ffd42f