Update git submodules

* Update docs/submodules/ccsdk/distribution.git from branch 'master'
  to 3894b3ff9c68db163b81efe9e46966179a487757
  - Install nss in alpine

    Install NSS as part of base ccsdk alpine image.  This is
    required by OpenDaylight and was originally installed as
    part of the base alpine image but is no longer included in
    latest alpine 3.8 image

    Change-Id: I79e6fee1372f623f3dceadb8a7a1aba6fd3d7d32
    Issue-ID: SDNC-701
    Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>

diff --git a/docs/submodules/ccsdk/distribution.git b/docs/submodules/ccsdk/distribution.git
index 25364ba..3894b3f 160000 (submodule)
--- a/docs/submodules/ccsdk/distribution.git
+++ b/docs/submodules/ccsdk/distribution.git
@@ -1 +1 @@
-Subproject commit 25364ba4d920bbd882abe5117dd170b53b3d54e3
+Subproject commit 3894b3ff9c68db163b81efe9e46966179a487757